Alexander Graham Bell was awarded a patent (#174,465) for the telephone in the United States in 1876. Before this invention, there had been many ideas, conceptual models and patent caveats about speaking telegraph, however, they were not practical and Bell's invention was granted a patent. Prior to this patent, Bell awarded a patent for transmitter and receivers for electric telegraphs. The first successful transmission of clear voice using a liquid transmitter was done on March 10, 1876.
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ReplyDeleteThe first successful transmission of clear voice using a liquid transmitter was done on March 10, 1876. ip pbx
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