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A sound-powered telephone is a communication device that allows users to talk to each other with the use of a handset, similar to a conventional telephone, but without the use of external power. This technology has been used since at least 1944 [ 1 ] for both routine and emergency communication on ships to allow communication between key ...
The Trimline base was available in desk-top and wall-mount versions. The handsets and bases were interchangeable. The Trimline was the first US telephone to achieve design recognition in Europe, where it was referred to as the "Manhattan" model or the "Gondola". [citation needed] Today, similarly designed telephones are sold by many companies ...
20 March 1880: National Bell Telephone merges with others to form the American Bell Telephone Company. 1 April 1880: world's first wireless telephone call on Bell and Tainter's photophone (distant precursor to fiber-optic communications) from the Franklin School in Washington, D.C. to the window of Bell's laboratory, 213 meters away. [20] [21]
In particular, AT&T acquired ownership of the ' Audion ', the first triode (three-element) vacuum tube, which greatly amplified telephone signals. The patent increased AT&T's control over the manufacture and distribution of long-distance telephone services and allowed the Bell System to build the United States' first coast-to-coast telephone line.
These made telephones an available and comfortable communication tool for many purposes, and it gave the impetus for the creation of a new industrial sector. The telephone exchange was an idea of the Hungarian engineer Tivadar Puskás (1844–1893) in 1876, while he was working for Thomas Edison on a telegraph exchange.
The carrier reasoned that plain old telephone service is, well, old, and demand is low. Only about 5% of the households AT&T serves use copper-based landlines, a company spokesperson said.
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