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In 1878, Edison took up the industrial implementation of an incandescent lamp, which brought him the greatest fame. The lamp was not his invention (where the priority belonged AN Lodygin and PN Yablochkov), but he became the creator of this type of lamp and a power distribution system for the first time able to work together efficiently. Lighting Edison system could and was able to compete with the gas lighting of the time. To enhance the practical application of electricity it was no less important than the invention itself lamps. In 1873, after thousands of experiments, he created a lamp (with carbon filament), which burned 40 hours. He designed the DC generators, transmission lines, and electrical networks, and later - three-wire system.
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