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George H. Sweigert (1920–1999) is credited as the first inventor to patent the cordless telephone. [1]Born in Akron, Ohio, Sweigert served five years in the US Army as a radio operator in World War II in Guadalcanal, Bougainville, Fiji and New Georgia assigned to the 145th Headquarters Company under the 37th Infantry Division (United States).
Alexander Graham Bell was awarded the first U.S. patent for the invention of the telephone in 1876. Elisha Gray, 1876, designed a telephone using a water microphone in Highland Park, Illinois. Tivadar Puskás proposed the telephone switchboard exchange in 1876. Thomas Edison invented the carbon microphone which produced a strong telephone ...
The US military uses a variety of phone connectors including 9 ⁄ 32-inch (0.281-inch, 7.14 mm) and 1 ⁄ 4-inch (0.25 inch, 6.35 mm) diameter plugs. [38] Commercial and general aviation (GA) civil aircraft headsets often use a pair of phone connectors. A standard 1 ⁄ 4-inch (6.3
Because of illness and other commitments, Bell made little or no telephone improvements or experiments for eight months until after his U.S. patent 174,465 was published., [26] but within a year the first telephone exchange was built in Connecticut and the Bell Telephone Company was created in 1877, with Bell the owner of a third of the shares ...
By 1920, assets were $1.4 billion; local revenue was $301 million; long-distance revenue was $142 million; profit was $48 million, and there were 231,000 employees. By 1950, assets had climbed to $10.3 billion; local call revenue was $2.0 billion and toll revenue was $1.2 billion, with a profit of $367 million, and 535,000 employees.
PBX switchboard, 1975. A telephone switchboard is a device used to connect circuits of telephones to establish telephone calls between users or other switchboards. The switchboard is an essential component of a manual telephone exchange, and is operated by switchboard operators who use electrical cords or switches to establish the connections.
Elisha Gray (August 2, 1835 – January 21, 1901) was an American electrical engineer who co-founded the Western Electric Manufacturing Company. Gray is best known for his development of a telephone prototype in 1876 in Highland Park, Illinois.
Nathan Beverly Stubblefield [1] (November 22, 1860 – March 28, 1928) was an American inventor best known for his wireless telephone work. Self-described as a "practical farmer, fruit grower and electrician", [2] he received widespread attention in early 1902 when he gave a series of public demonstrations of a battery-operated wireless telephone, which could be transported to different ...