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In 1947, the American Telephone and Telegraph Company (AT&T) devised the first nationwide telephone numbering plan and assigned the original North American area codes. The state of California was divided into three numbering plan areas (NPAs) with distinct area codes: 213, 415, and 916, for the southern, central, and northern parts of the state ...
Area codes 510 and 341 are telephone area codes in the North American Numbering Plan (NANP) serving much of the East Bay in the U.S. state of California. They cover parts of Contra Costa County and western Alameda County, including the city of Oakland, but excluding Dublin, Livermore, Pleasanton, and Sunol. Area code 510 was established on ...
When a horse listed at 12:1 odds won, but paid off at 4:1, Straus recognized the need for a more accurate and transparent system. He began developing his innovative machine, the totalisator, also known as the "tote board" using telephone relays [ 1 ] in 1928.
The additional demands for PCS and cellular phone numbers helped necessitate the 831/408 area code split, the 650/415 split, and the earlier 510/415 split. Part of the previous dialing plan included a mass calling prefix for radio station contests, introduced in the 1960s because some contests put unacceptable loads on the Bay Area's telephone ...
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Valona is an unincorporated community in Contra Costa County, California, United States. [1] It is located in the bluffs above Crockett, 5.5 miles (9 km) west-northwest of Martinez, [3] at an elevation of 62 feet (19 m). [1] The similar village of Selby is located nearby. The ZIP Code is 94525. The community is inside area codes 510 and 341.
Area code 415 was assigned to central California, south of area code 916, and north of area code 213. It stretched from Sacramento in the north to Bakersfield in the south. [2] In 1950, the boundaries of the numbering plan area were redrawn to produce a division of the northern and central parts along a north–south-running dividing line.
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