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WebAdditional inventions such as the call bell, central telephone exchange, common battery, ring tone, amplification, trunk lines, and wireless phones – at first cordless and then fully mobile – made the telephone the useful …
WebHis research on hearing and speech further led him to experiment with hearing devices which eventually culminated in Bell being awarded the first U.S. patent for the telephone, on March 7, 1876. Bell considered his …
WebMay 21, 2021 · Learn about the history of the telephone, from its origins in sound research to its patent and commercialization by Alexander Graham Bell. Find out how Bell made the first telephone call to his assistant …
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