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Telephone numbers listed in 1920 in New York City having three-letter exchange prefixes. In the United States, the most-populous cities, such as New York City, Philadelphia, Boston, and Chicago, initially implemented dial service with telephone numbers consisting of three letters and four digits (3L-4N) according to a system developed by W. G. Blauvelt of AT&T in 1917. [1]
The telephone played a major communications role in American history from the 1876 publication of its first patent by Alexander Graham Bell onward. In the 20th century the American Telephone and Telegraph Company (AT&T) dominated the telecommunication market as the at times largest company in the world, until it was broken up in 1982 and replaced by a system of competitors.
The service preceded the system of toll-free telephone numbers with area code 800 in the United States. Some areas used the names "Enterprise" or "WX" number. [2] Introduced in the 1930s, a Zenith number was listed in local directories in each community from which a business desired to receive calls.
Pagers moved into 076xx, while personal numbers moved to 070. Mobile phone numbers moved into the 077xx, 078xx and 079xx ranges (and more recently, 075xx, 074xx, 073xx and 071xx have also been brought into use). [37] The exception to this was Manx Telecom mobile phone numbers, where the code became 07624 in order to match the 01624 used for ...
The early history of the telephone became and still remains a confusing morass of claims and counterclaims, which were not clarified by the huge number of lawsuits filed in order to resolve the patent claims of the many individuals and commercial competitors. The Bell and Edison patents, however, were commercially decisive, because they ...
3 April 1930: Opening of transoceanic telephone service to Argentina, Chile, and Uruguay and subsequently to all other South American countries. [ 23 ] 1931: The Ericsson DBH 1001 telephone was the first telephone without a separate ringer box .
Telephone dial number card of c.1948 with the local telephone number 4-5876 in Atlantic City, NJ, using the central office prefix 4, later converted to AT4 Face of a 1939 rotary telephone dial with the telephone number LA-2697, which includes the first two letters of Lakewood, New Jersey, as the central office prefix, later converted to LA6.
The first tube shaft candlestick telephone was the Western Electric #20B Desk Phone patented in 1904. [1] In the 1920s and 1930s, telephone technology shifted to the design of more efficient desktop telephones that featured a handset with receiver and transmitter elements in one unit, making the use of a telephone more convenient.