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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]
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 ...
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.
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.
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.
District of Columbia flag Badge of a Deputy U.S. Marshal. This is a list of law enforcement agencies in the District of Columbia.. According to the US Bureau of Justice Statistics' 2008 Census of State and Local Law Enforcement Agencies, the District has six local law enforcement agencies employing 4,262 sworn police officers, about 722 for each 100,000 residents.
With DDD, customers themselves dialed an area code followed by a seven-digit telephone number to initiate long-distance calls without operator assistance. Activated first in 1951 for about ten thousand customers in Englewood, New Jersey, DDD was available in the major cities by the early 1960s, but was not fully implemented until the 1970s.
C Street looking northeast. The Henry J. Daly Building (previously known as the Municipal Center and also referred to as 300 Indiana and the Daly Building) is located at 300 Indiana Avenue, NW, and 301 C Street, NW, in the Judiciary Square neighborhood of Washington, D.C., United States.