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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 first letter for standard amateur stations came from the range A-W. For Experimental stations, the first letter was "X", a practice that is still followed. "Y" was reserved for Technical and Training School stations, and "Z" for Special Amateurs. [30] More letters were added as the number of stations grew.
These 67 different three-letter call signs are currently grouped as follows: 25 assigned only to an AM station. 8 assigned only to an FM station. 6 assigned only to a TV station. 13 assigned to both an AM and an FM station. 8 assigned to both an AM and a TV station. 7 assigned to an AM, FM, and TV station.
These letters have been used for multiple purposes. Originally, they referred to the leading letters of telephone exchange names.In the mid-20th century United States, before the switch to All-Number Calling, telephone numbers had seven digits including a two-digit prefix which was expressed in letters rather than digits, e.g.; KL5-5445.
This is a list of full-service television stations in the United States having call signs which begin with the letter W. Stations licensed to transmit under low-power specifications—ex., WOCV-CD, W16DQ-D and WIFR-LD—have not been included.
Here's a list of scammer phone numbers and area codes to avoid answering if you don't know exactly who's calling. ... 888 numbers indicate it is a toll-free call. Calls made to toll-free numbers ...
8. Spy Dialer. Spy Dialer is a free reverse phone lookup service that accesses public databases of registered phone numbers to help users find information on cell phone and landline numbers and ...
With the depletion of new numbers in area codes 312 and 773, an overlay of both of them, area code 872, was created in November 2009, beginning ten-digit dialing within the city limits of Chicago. The remaining area without an overlay in the northern part of Illinois, 708, eventually received such with area code 464 taking effect on January 21 ...