Search Results for: Telephone answering machine sound reproducing
patents. the first such franchisee, george coy of new haven, ct, invented the telephone switchboard, and with it opened the world's first telephone exchange in new haven on january , . the telephone caught on; by there were telephone exchanges licensed in almost every place in the united states with
executive e.b. craft, who, in , recognized that telephone and transmission research and develop- ment provided all the piece-parts (i.e., amplifiers, loudspeakers, mi- crophones, and electrical recording) for the addition of sound to movies, except for the means to synchronize sound and picture in both...
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