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Books > Professional & Technical > Technology: general issues > Inventions & inventors

Nikola Tesla (1956) (Paperback): Nikola Tesla Museum Nikola Tesla (1956) (Paperback)
Nikola Tesla Museum
R1,167 Discovery Miles 11 670 Ships in 18 - 22 working days

Contains lectures, patents and articles by the scientist and inventor who developed the AC current system and contributed greatly to science and humanity. This volume is a collection of documents chosen not only as precious evidence of Tesla's important scientific work, but they also provide a worthy signpost for the present and future generations of inventors of all fields of science and technics. Includes hundreds of diagrams and illustrations. This scarce work has four pages that have portions that are illegible.

The mechanical Turk - The true story of a chess playing machine that fooled the world (Paperback, New Ed): Tom Standage The mechanical Turk - The true story of a chess playing machine that fooled the world (Paperback, New Ed)
Tom Standage 2
R105 Discovery Miles 1 050 Ships in 4 - 6 working days

In 1770 in the imperial court of Vienna, one of the most extraordinary and baffling hoaxes in history was set in motion. 

As soon as it was unveiled to the cries of shocked courtiers, the Mechanical Turk became a sensation: a life-sized clockwork figure dressed in Eastern costume that, somehow, could play world-class chess. For decades this incredible automaton confounded audiences across Europe and America. It trounced grand masters, outwitted Napoleon, defeated Benjamin Franklin and was even said to have stopped Catherine the Great from cheating.

What was its secret? Could a machine really think? During its chequered career the Turk sparked frenzied speculation and often downright fabrication, but it was nearly a century before the truth was finally discovered …  

Books, Banks, Buttons - And Other Inventions from the Middle Ages (Hardcover): Chiara Frugoni Books, Banks, Buttons - And Other Inventions from the Middle Ages (Hardcover)
Chiara Frugoni; Translated by William McCuaig
R495 Discovery Miles 4 950 Ships in 4 - 6 working days

Once regarded by historians as a period of intellectual stagnation, the Middle Ages were actually a time of extraordinary cultural and technological innovation. This entertaining romp through the inventions of the period tells the story of the first appearance of dozens of items and ideas of lasting significance. From this misunderstood age we get our buttons, our underwear, and our trousers; we entertain ourselves with medieval playing cards, tarot cards, and chess. It was during the Middle Ages that domesticated cats first found their way into our houses, along with glazed windows, dining tables and chairs, and fireplaces. Numerous labor-saving devices originated then as well, including the wheelbarrow, the windmill and watermill, and the effective use of the horse. War became more deadly with the introduction of gunpowder, while travel over water became less so thanks to the compass and the rudder. Time itself emerged into recognizably modern form, with the advent of clocks -- based on the escapement mechanism -- that measured hours of equal length independent of the changing seasons. More cosmic notions of time developed as well, as the new realm of purgatory broke the traditional dichotomy of heaven and hell. Even Santa Claus first captured the imagination of children during the Middle Ages. Ranging from the invention of eyeglasses (by a now-forgotten layperson who sought to keep his methods secret, the better to profit from them) to the creation of the fork (at first regarded as an instrument of diabolical perversion but embraced when it helped people handle another invention of the age, pasta), this beautifully illustrated volume is a fitting tribute to an era from which we still benefit today.

Thomas Alva Edison: Sixty Years of an Inventor's Life (1907) (Paperback): Francis Arthur Jones Thomas Alva Edison: Sixty Years of an Inventor's Life (1907) (Paperback)
Francis Arthur Jones
R999 Discovery Miles 9 990 Ships in 18 - 22 working days

The author extends his gratitude to Thomas Alva Edison for taking time away from his experimental laboratory to give much of the personal history which is found within this work. This book is not an exhaustive life of Edison, considering at the time it was written Edison was around 60 years old and had swore he had quit the inventing business, devoting himself to pure science. Jones takes the reader on a journey from Edison's birthplace to his travels in Europe. Handsomely illustrated.

Inventorship - The Art of Innovation (Paperback): Leonard M. Greene Inventorship - The Art of Innovation (Paperback)
Leonard M. Greene
R708 R630 Discovery Miles 6 300 Save R78 (11%) Ships in 18 - 22 working days

"From this lively and personal account, we learn that we can all practice inventorship to great advantage–measured either in gold or pleasure, or perhaps both!"–From the Foreword by Walter Cronkite

"Inventorship is truly the stuff from which the future will be molded. Giving us an insight into the everyday thought processes of great inventive minds, Greene’s wonderful collection of stories and ideas is a model for each of us in the art of inventiveness."–Pat Hallberg, Executive Director, National Inventors Hall of Fame

"This entertaining and well-written work educates without pain and motivates the reader to learn more. It should be widely read not only by business people and entrepreneurs, but by young people, their parents, and their teachers. The lesson: Inventorship is for everyone and can change lives for the better."–Joseph N. Hankin, President, Westchester Community College

"After all the scholarly books and articles about innovation and the entrepreneurial process by theorists, how refreshing it is to hear from a real live inventor holding hundreds of patents in fields as diverse as aeronautics, sailing, chess, and skiing! He has even invented a word, ‘inventorship’, to describe the process and guide us through dozens of examples. A very useful book."–John Diebold, Chairman, The JD Consulting Group, Inc.

Restoring Baird's Image (Hardcover, illustrated edition): Donald F. McLean Restoring Baird's Image (Hardcover, illustrated edition)
Donald F. McLean
R1,721 R1,600 Discovery Miles 16 000 Save R121 (7%) Ships in 18 - 22 working days

John Logie Baird, Britain's foremost television pioneer, experimented with video recording onto gramophone discs in the late 1920s. Though unsuccessful at the time, his experiments resulted in several videodiscs, some 25 years before the videotape recorder became practical. These videodiscs - called Phonovision - remained neglected over the decades, considered by experts as unplayable. In the early 1980s, the author sought out and restored the surviving Phonovision discs. Using computer-based techniques in an investigation reminiscent of an archaeological dig, the author has not only revealed the images on the discs but also uncovered details of how the recordings were made. The Phonovision discs have now become recognised as one of Baird's most important legacies. In 1996 and 1998, amateur 'off-air' recordings of the BBC's 30-line Television Service (1932-35) were found, giving us our first view of what viewers were then watching. The author's restoration overturns established views on mechanically scanned television, providing us today with a true measure of Britain's heritage of television programme-making before electronic television. As well as helping to explain a poorly understood and complex period in television's history, this unique book, heavily illustrated with previously unpublished or rarely-seen historic photographs restored by the author, sheds light on the achievements of Baird, the development of video recording and the definition and invention of television itself.

The Life and Times of A.D. Blumlein (Hardcover): Russell Burns The Life and Times of A.D. Blumlein (Hardcover)
Russell Burns
R2,311 R2,127 Discovery Miles 21 270 Save R184 (8%) Ships in 18 - 22 working days

Alan Dower Blumlein was a genius and has been described as the greatest British electronics engineer of the twentieth century. Although he was tragically killed at the age of 38, he contributed enormously to the fields of telephony and electrical measurements, monophonic and stereophonic recording and reproduction, high definition television, electronics, antennas and cables, and radar systems of various types. His accidental death in June 1942 was described by an Air Chief Marshal as 'a catastrophe', and the Secretary of State for Air said that 'it would be impossible to over-rate the importance of the work on which [Blumlein was] engaged': his loss was a 'national disaster'. He was responsible for saving many thousands of lives during the Second World War, and his endeavours in peacetime led to pleasure being given to millions of people. This meticulous, extensively researched and well-referenced book presents a balanced account of the life and times of a brilliant engineer. It is certain to be the major biographical source on Blumlein for all historians of technology and science.

To the Moon on a Plastic Bottle (Paperback): Linor Bar-El, Dan Raviv To the Moon on a Plastic Bottle (Paperback)
Linor Bar-El, Dan Raviv
R412 R386 Discovery Miles 3 860 Save R26 (6%) Ships in 18 - 22 working days
Lavoisier—the Crucial Year - The Background and Origin of His First Experiments on Combustion in 1772 (Paperback): Henry... Lavoisier—the Crucial Year - The Background and Origin of His First Experiments on Combustion in 1772 (Paperback)
Henry Guerlac
R640 Discovery Miles 6 400 Ships in 18 - 22 working days

The author explores the origins of the eighteenth-century chemical revolution as it centers on Antoine-Laurent Lavoisier's earliest work on combustion. He shows that the main lines of Lavoisier's theory—including his theory of a heat-fluid, caloric—were elaborated well before his discovery of the role played by oxygen. Contrary to the opinion prevailing at that time, Lavoisier suspected, and demonstrated by experiment, that common air, or some portion of it, combines with substances when they are burned. Professor Guerlac examines critically the theories of other historians of science concerning these first experiments, and tries to unravel the influences which French, German, and British chemists may have had on Lavoisier. He has made use of newly discovered material on this phase of Lavoisier's career, and includes an appendix in which the essential documents are printed together for the first time.

The Life and Legend of James Watt - Collaboration, Natural Philosophy, and the Improvement of the Steam Engine (Paperback):... The Life and Legend of James Watt - Collaboration, Natural Philosophy, and the Improvement of the Steam Engine (Paperback)
David Philip Miller
R1,130 Discovery Miles 11 300 Ships in 18 - 22 working days

The Life and Legend of James Wattoffers a deeper understanding of the work and character of the great eighteenth-century engineer. Stripping away layers of legend built over generations, David Philip Miller finds behind the heroic engineer a conflicted man often diffident about his achievements but also ruthless in protecting his inventions and ideas, and determined in pursuit of money and fame. A skilled and creative engineer, Watt was also a compulsive experimentalist drawn to natural philosophical inquiry, and a chemistry of heat underlay much of his work, including his steam engineering. But Watt pursued the business of natural philosophy in a way characteristic of his roots in the Scottish "improving" tradition that was in tension with Enlightenment sensibilities. As Miller demonstrates, Watt's accomplishments relied heavily on collaborations, not always acknowledged, with business partners, employees, philosophical friends, and, not least, his wives, children, and wider family. The legend created in his later years and "afterlife" claimed too much of nineteenth-century technology for Watt, but that legend was, and remains, a powerful cultural force.

Entdeckt, erdacht, erfunden - 20 Goettinger Geschichten von Genie und Irrtum (German, Paperback): Teresa Nentwig, Katharina... Entdeckt, erdacht, erfunden - 20 Goettinger Geschichten von Genie und Irrtum (German, Paperback)
Teresa Nentwig, Katharina Trittel
R545 Discovery Miles 5 450 Ships in 10 - 15 working days

Goettingen, "die Stadt, die Wissen schafft", die Stadt der Nobelpreistrager. Wegweisende Erfindungen gehen auf Goettinger zuruck, manche in Goettingen entwickelte Idee ist wiederum langst vergessen. Einige brachten Fortschritt und Innovation, andere Skandale und Ungluck, wieder andere sollten dem Erfinder zu grossem Ruhm verhelfen, scheiterten aber schon in ihrer Entstehung. Jenseits der bekannten Namen wie Gauss und Weber wirft dieses Buch die Frage auf, wie Wissen in Goettingen in unterschiedlichen Bereichen und Jahrhunderten entwickelt wurde, zu welchem Preis mancher seine Forschung vorantrieb und welche Geschichte hinter den Ideen steht. Vom ersten Goettinger Nobelpreistrager Otto Wallach, der 1910 mit seinen Forschungen den Grundstein fur die Herstellung von Duft- und Aromastoffen legte, uber den Nukleus der Rassenideologie bis hin zum Kokain spannt der Sammelband einen Bogen uber die kuriosesten, bahnbrechendsten und verwerflichsten Ideen auf, die ihren Ursprung in Goettingen nahmen.

1001 Inventions - The Enduring Legacy of Muslim Civilization (Paperback, 3): National Geographic 1001 Inventions - The Enduring Legacy of Muslim Civilization (Paperback, 3)
National Geographic
R820 R750 Discovery Miles 7 500 Save R70 (9%) Ships in 18 - 22 working days

"1001 Inventions: The Enduring Legacy of Muslim Civilization" takes readers on a journey through years of forgotten Islamic history to discover one thousand fascinating scientific and technological inventions still being used throughout the world today. Take a look at all of the discoveries that led to the great technological advances of our time; engineering, early medicinal practices, and the origins of cartography are just a few of the areas explored in this book.
" 1001 Inventions" provides unique insight into a significant time period in Muslim history that has been looked over by much of the world. A time where discoveries were made and inventions were created that have impacted how Western civilization and the rest of the world lives today. The book will cover seven aspects of life relatable to everyone, including home, school, hospital, market, town, world and universe.

Inventology - How We Dream Up Things That Change the World (Paperback): Pagan Kennedy Inventology - How We Dream Up Things That Change the World (Paperback)
Pagan Kennedy
R440 Discovery Miles 4 400 Ships in 18 - 22 working days
Ingenious Patents (Revised) - Bubble Wrap, Barbed Wire, Bionic Eyes, and Other Pioneering Inventions (Hardcover, Revised ed.):... Ingenious Patents (Revised) - Bubble Wrap, Barbed Wire, Bionic Eyes, and Other Pioneering Inventions (Hardcover, Revised ed.)
Ben Ikenson, Jay Bennett
R595 R349 Discovery Miles 3 490 Save R246 (41%) Ships in 10 - 15 working days

Discover some of the most innovative of the 6.5 million patents that the U.S. Patent and Trademark Office has granted since Thomas Jefferson issued the first one in 1790. Updated and reformatted from the original 2004 edition, Ingenious Patents presents each device along with background about the inventor, interesting sidebars and history, and an excerpt from the original patent application. Liberally sprinkled throughout are photos of original models and patent diagrams created by the inventors themselves and annotated to show exactly how each item works. Entries include creative commercial successes in fields as diverse as medicine, aeronautics, computing, agriculture, and consumer goods. Readers are certain to find a topic of interest here, whether it is the history behind the patent for a Pez dispenser, cathode ray tube, kitty litter, DNA fingerprinting, or the design of a Fender Stratocaster guitar.

The Greatest Invention - A History of the World in Nine Mysterious Scripts (Hardcover): Silvia Ferrara The Greatest Invention - A History of the World in Nine Mysterious Scripts (Hardcover)
Silvia Ferrara; Translated by Todd Portnowitz
R499 R452 Discovery Miles 4 520 Save R47 (9%) Ships in 5 - 10 working days

'Ferrara's book is an introduction to writing as a process of revelation, but it's also a celebration of these things still undeciphered, and many other tantalising mysteries besides.' Spectator This book tells the story of our greatest invention. Or, it almost does. Almost, because while the story has a beginning - in fact, it has many beginnings, not only in Mesopotamia, 3,100 years before the birth of Christ, but also in China, Egypt and Central America - and it certainly has a middle, one that snakes through the painted petroglyphs of Easter Island, through the great machines of empires and across the desks of inspired, brilliant scholars, the end of the story remains to be written. The invention of writing allowed humans to create a record of their lives and to persist past the limits of their lifetimes. In the shadows and swirls of ancient inscriptions, we can decipher the stories they sought to record, but we can also tease out the timeless truths of human nature, of our ceaseless drive to connect, create and be remembered. The Greatest Invention chronicles an uncharted journey, one filled with past flashes of brilliance, present-day scientific research and the faint, fleeting echo of writing's future. Professor Silvia Ferrara, a modern-day adventurer who travels the world studying ancient texts, takes us along with her; we touch the knotted, coloured strings of the Incan khipu and consider the case of the Phaistos disk. Ferrara takes us to the cutting edge of decipherment, where high-powered laser scanners bring tears to an engineer's eye, and further still, to gaze at the outline of writing's future. The Greatest Invention lifts the words off every page and changes the contours of the world around us - just keep reading. 'The Greatest Invention is a celebration not of achievements, but of moments of illumination and "the most important thing in the world: our desire to be understood."' TLS

David Kakabadze - Georgian Modern Artist & Inventor (Hardcover): Ketevan Kintsurashvili David Kakabadze - Georgian Modern Artist & Inventor (Hardcover)
Ketevan Kintsurashvili
R3,748 Discovery Miles 37 480 Ships in 10 - 15 working days

This book is dedicated to the great Georgian modern artist David Kakabadze (1889-1952). This book compares the importance of David Kakabadze's creative work against the background of world avant-garde art of the beginning of the 20th century. This book is of interest for art historians and other experts, studying Georgian and Soviet art/culture, modern art and, especially, abstract art.

It's Never Too Late - The Joe Biden Effect - Stories of People Who Changed the World in Later Life -  Foreword by Michael... It's Never Too Late - The Joe Biden Effect - Stories of People Who Changed the World in Later Life - Foreword by Michael Whitehall (Hardcover)
R481 Discovery Miles 4 810 Ships in 10 - 15 working days

As Joe Biden has shown us all, the best is yet to come. Here are the stories of the inspiring, inventive, and brave things people have achieved in later life. With a foreword by Michael Whitehall, late bloomer par excellence. With life comes perspective, wisdom, judgement and depth. You are as likely to change the world after middle age as you were before it - and perhaps more likely to change it for the better. From the well known to the unsung, each entry tells the story of how older age was no barrier to impressive feats of intellect, creativity and daring. Ranging from Alexander Fleming, Stan Lee and Baroness Trumpington, to Whina Cooper and the bestselling novelist Mary Wesley who didn't write her first novel until she was 71, and William Ivy Baldwin who tightrope walked across a canyon at 82. Here is a celebration of the amazing things we humans have shown to be possible in later life. A gift book for late bloomers, baby boomers, and beyond; and an inspiring picture of the possibilities and potential that older age holds.

20 Makey Makey Projects for the Evil Genius (Paperback, Ed): Aaron Graves, Colleen Graves 20 Makey Makey Projects for the Evil Genius (Paperback, Ed)
Aaron Graves, Colleen Graves
R811 R758 Discovery Miles 7 580 Save R53 (7%) Ships in 18 - 22 working days

20 fun and inventive Makey Makey projects for Makers from beginner to expert This hands-on guide is filled with DIY projects that show readers, step-by-step, how to start creating and making cool inventions with the Makey Makey invention kit. Each project features easy-to-follow, fully-illustrated instructions and detailed photographs of the finished gadget. Readers will see how to apply these skills and start building their own Makey Makey projects. 20 Makey Makey Projects for the Evil Genius starts off with very approachable introductory projects, making it a great starting point for beginners. It then builds to more challenging projects, allowing more experienced users to go further by incorporating technologies like Raspberry Pi, Processing and Scratch programming, 3D Printing, and creating wearable electronics with Makey Makey. Projects are divided into four categories: "Fun and Games," Interactive," Hacks and Pranks," and "Makey Makey Go." * No prior programming or technical experience is required * Basic enough for beginners, but challenging enough for advanced makers * Written by two educators who believe in fostering creative innovation for all

Essentials of Intellectual Property 2e - Law Economics, and Strategy (Paperback, 2nd Edition): AI Poltorak Essentials of Intellectual Property 2e - Law Economics, and Strategy (Paperback, 2nd Edition)
AI Poltorak
R997 R851 Discovery Miles 8 510 Save R146 (15%) Ships in 18 - 22 working days

The definitive primer on intellectual property for business professionals, non-IP attorneys, entrepreneurs, and inventors

Full of valuable tips, techniques, illustrative real-world examples, exhibits, and best practices, the "Second Edition" of this handy and concise paperback will help you stay up to date on the newest thinking, strategies, developments, and case law in intellectual property.Presents fundamentals of patents, trademarks, copyrights, trade secrets and other less-know forms of IP, such as registered design and mask worksCovers important concepts such as IP strategy, protection, audits, valuation, management, and competitive intelligenceOffers an introduction to IP licensing and enforcementNow features discussion of critical precedent-setting recent IP cases and proposed patent reform

Providing business professionals and IP owners with in-depth knowledge of this extremely important subject, this book helps those new to this field gain a better understanding and appreciation for the results of their creative abilities.

Ethereum - La guia esencial para principiantes en inversion en Ethereum, mineria y contratos inteligentes (Spanish, Paperback):... Ethereum - La guia esencial para principiantes en inversion en Ethereum, mineria y contratos inteligentes (Spanish, Paperback)
Herbert Jones
R342 Discovery Miles 3 420 Ships in 18 - 22 working days
Konstruktion-Bewegung-Modelle (German, Paperback): Wolfgang Duchting Konstruktion-Bewegung-Modelle (German, Paperback)
Wolfgang Duchting
R420 Discovery Miles 4 200 Ships in 18 - 22 working days
Reginald Sutcliffe and the Invention of Modern Weather Systems Science (Hardcover): Jonathan E. Martin Reginald Sutcliffe and the Invention of Modern Weather Systems Science (Hardcover)
Jonathan E. Martin
R2,742 Discovery Miles 27 420 Ships in 18 - 22 working days

Despite being perhaps the foremost British meteorologist of the twentieth century, Reginald Sutcliffe has been understudied and underappreciated. His impact continues to this day every time you check the weather forecast. Reginald Sutcliffe and the Invention of Modern Weather Systems Science not only details Sutcliffe's life and ideas, but it also illuminates the impact of social movements and the larger forces that propelled him on his consequential trajectory. Less than a century ago, a forecast of the weather tomorrow was considered a practical impossibility. This book makes the case that three important advances guided the development of modern dynamic meteorology, which led directly to the astounding progress in weather forecasting-and that Sutcliffe was the pioneer in all three of these foundational developments: the application of the quasi-geostrophic simplification to the equations governing atmospheric behavior, adoption of pressure as the vertical coordinate in analysis, and development of a diagnostic equation for vertical air motions. Shining a light on Sutcliffe's life and work will, hopefully, inspire a renewed appreciation for the human dimension in scientific progress and the rich legacy bequeathed to societies wise enough to fully embrace investments in education and basic research. As climate change continues to grow more dire, modern extensions of Sutcliffe's innovations increasingly offer some of the best tools we have for peering into the long-term future of our environment.

Reginald Sutcliffe and the Invention of Modern Weather Systems Science (Paperback): Jonathan E. Martin Reginald Sutcliffe and the Invention of Modern Weather Systems Science (Paperback)
Jonathan E. Martin
R1,204 Discovery Miles 12 040 Ships in 18 - 22 working days

Despite being perhaps the foremost British meteorologist of the twentieth century, Reginald Sutcliffe has been understudied and underappreciated. His impact continues to this day every time you check the weather forecast. Reginald Sutcliffe and the Invention of Modern Weather Systems Science not only details Sutcliffe's life and ideas, but it also illuminates the impact of social movements and the larger forces that propelled him on his consequential trajectory. Less than a century ago, a forecast of the weather tomorrow was considered a practical impossibility. This book makes the case that three important advances guided the development of modern dynamic meteorology, which led directly to the astounding progress in weather forecasting-and that Sutcliffe was the pioneer in all three of these foundational developments: the application of the quasi-geostrophic simplification to the equations governing atmospheric behavior, adoption of pressure as the vertical coordinate in analysis, and development of a diagnostic equation for vertical air motions. Shining a light on Sutcliffe's life and work will, hopefully, inspire a renewed appreciation for the human dimension in scientific progress and the rich legacy bequeathed to societies wise enough to fully embrace investments in education and basic research. As climate change continues to grow more dire, modern extensions of Sutcliffe's innovations increasingly offer some of the best tools we have for peering into the long-term future of our environment.

Creativity, Problem Solving, and Aesthetics in Engineering - Today's Engineers Turning Dreams into Reality (Hardcover, 1st... Creativity, Problem Solving, and Aesthetics in Engineering - Today's Engineers Turning Dreams into Reality (Hardcover, 1st ed. 2020)
David Blockley
R902 Discovery Miles 9 020 Ships in 10 - 15 working days

This book illuminates what engineering is and how it relates to other disciplines such as art, architecture, law, economics, science, technology, and even religion. The author explains, from an intrinsic as well as descriptive perspective, why engineering is essential for our collective well-being, and how, like medicine, it is undertaken by people, and for people, to improve the human condition. He brings out the 'magic' of engineering practice as well as addressing the darker aspects such as warfare and the misuse of the internet. A too commonly held view assumes that the practice of engineers is a cold, purely quantitative and wholly technical enterprise of applying know science, and devoid of creativity or aestheticism. In 2013 the United States National Academy of Engineering launched a campaign called "Changing the Conversation, Messages for Improving Public Understanding of Engineering" with four messages to impart about engineers: that they make a world of difference; are creative problem solvers; that they help shape the future, and are essential to health, happiness, and safety. In this volume, Professor Blockley incorporate these messages into an engaging exposition of engineering accomplishment in all of its evolving diversity, from the technician to the academic research engineer, illustrating the continuum of thinking and purpose from the fixer of the gas boiler to the designers of the A380 and the iPhone.

Crea un invento de exito paso a paso (Spanish, Paperback): Jhon A Promoingenio Com Crea un invento de exito paso a paso (Spanish, Paperback)
Jhon A Promoingenio Com
R498 Discovery Miles 4 980 Ships in 18 - 22 working days
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