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Thomas Edison invented the automatic repeater, duplex telephone, phonograph, the electric pen, the microphone, the megaphone, kinetoscope, the microtasimeter, and the quadruplex and sextuplex transmitters.
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Thomas Edison invented the automatic repeater, duplex telephone, phonograph, the electric pen, the microphone, the megaphone, kinetoscope, the microtasimeter, and the quadruplex and sextuplex transmitters.