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(More customer reviews)Thomas Edison (1847-1931) was born into an agrarian society and incurred hearing loss in both ears - probably due to a childhood encounter with scarlet fever. His early years were spent as an itinerant telegrapher. After an initial unsatisfactory experience inventing a product nobody wanted, he then focused on saleable products.
Early on Edison established an R&D "factory" at Menlo Park, N.J. with a goal of a minor invention every ten days, a major one every six months. Long hours, broken up for cat-naps were the rule. After inventing the phonograph he became world famous.
Edison was granted 1,093 patents, four hundred involving the light bulb and ancillary support - eg. wires, power sockets, power generation, etc. Over 3,000 materials were tested for light-bulb filaments, with carbonized cotton the final selection.
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