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IEEE MEMBERSHIP & STAFF
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ABOUT IEEE GHN
 The IEEE Global History Network is dedicated to preserving and promoting the history of innovation in the fields of electrical engineering, electronics and computing, and all their related fields. Learn more... THIS DAY IN HISTORY
12 March On this day in 1877 Thomas Edison made a crucial discovery ('that the whole question was one of pressure only, and that it was not necessary that the diaphragm should vibrate at all') that made his carbon transmitter (microphone) extremely effective.
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