Elisha Gray
Elisha Gray was an American electrical engineer who cofounded the Western Electric Manufacturing Company. Gray is best known for his development of a telephone prototype in 1876 in Highland Park, Illinois. Some recent authors have argued that Gray should be considered the true inventor of the telephone because Alexander Graham Bell allegedly stole the idea of the liquid transmitter from him, although Bell had been using liquid transmitters in his telephone experiments for more than two years previously. Bells telephone patent was held up in numerous court decisions.
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Source: Wikipedia