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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]
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.
C&P Tel. Co. of Maryland logo, 1964-1969. The C&P Telephone Company of Maryland was founded in 1884 as The Chesapeake and Potomac Telephone Company of Baltimore City. [1] It changed its name to The Chesapeake and Potomac Telephone Company of Maryland on January 3, 1956, and the corporate name at this point changed to C&P Telephone of Maryland.
The Bell System dial service implemented a feature called automatic number identification (ANI) which facilitated services like automated billing, toll-free 800-numbers, and 9-1-1 service. In manual service, the operator knows where a call is originating by the light on the switchboard jack field.
The architecture of the PSTN evolved over time to support an increasing number of subscribers, call volume, destinations, features, and technologies. The principles developed in North America and in Europe were adopted by other nations, with adaptations for local markets.
Just Words. If you love Scrabble, you'll love the wonderful word game fun of Just Words. Play Just Words free online! By Masque Publishing
If a 1-202-574 number was in use in the District, the corresponding 1-703-574 number or 1-301-574 number could only be assigned to jurisdictions a safe distance from the metropolitan area, such as southwestern Virginia or the Eastern Shore of Maryland. Conversely, if a 1-703-552 number was in use in Northern Virginia or a 1-301-552 Maryland ...
Each telephone on the continent was uniquely identified by a telephone number of ten digits. By the end of 1948, AT&T commenced the wider use of the system with the cutover of new crossbar switching systems for toll-dialing in New York and Chicago, [ 4 ] which resulted in the handling of about ten percent of all Bell System long-distance ...