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A genius in the practical application of scientific principles, Edison was one of the greatest and most productive inventors of his time. His first inventions were the transmitter and receiver for the automatic telegraph, the quadruplex system of transmitting four simultaneous messages, and an improved stock-ticker system. Edison created the first commercially practical incandescent lamp (with a carbon filament) in 1879. Moreover, for use with it he developed a complete electrical distribution system for light and power, including generators, motors, light sockets with the Edison base, junction boxes, safety fuses, underground conductors, and other devices.
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