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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]
Telephone companies often give names to their central offices. [9] The names frequently relate to the name given to the exchanges served from that office in the days of two-letter, five-number dialing, where a telephone number might have been referred to as "MOhawk 3-1234". The numbers are now listed as all-figures, so (713) MOhawk x-xxxx ...
A telephone exchange, telephone switch, ... (two-letter exchange name and either four or five digits), ... which had a crank for the signaling generator. To alert the ...
Under the North American Numbering Plan, all telephone exchanges run from 200 to 999 with similar restrictions on telephone area codes. Like the reservation on area codes with "9" as the middle area code digit, the restrictions on "0" and "1" are intended to facilitate a possible future expansion which would lengthen all North American numbers ...
Exchange names were usually closely tied to the physical location of telephone exchanges, being either the name of a city, town or village or district. The length of early telephone numbers depended on the number of subscribers attached to a particular exchange: if there were fewer than 10 subscribers, a single digit sufficed.
The world's first telephone exchange took place on Jan. 28, 1878. Three weeks later, Coy published a list of New Haven's 50 phone subscribers (names of people and businesses only, as phone numbers ...
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