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Worldwide distribution of country calling codes. Regions are coloured by first digit. Country calling codes, country dial-in codes, international subscriber dialing (ISD) codes, or most commonly, telephone country codes are telephone number prefixes for reaching telephone subscribers in foreign countries or areas via international telecommunication networks.
Summary. Description. Emergency telephone numbers in the world.svg. 112. 911. 112 and 911. Other number or redirection for mobile phones only. English: Implementation of the two ITU approved emergency telephone numbers in the world. Français : Utilisation des deux numéros d'appel d'urgence approuvés par l' UIT dans le monde.
File:Country calling codes map.svg. Size of this PNG preview of this SVG file: 800 × 409 pixels. Other resolutions: 320 × 163 pixels | 640 × 327 pixels | 1,024 × 523 pixels | 1,280 × 654 pixels | 2,560 × 1,308 pixels | 1,715 × 876 pixels. This is a file from the Wikimedia Commons. Information from its description page there is shown below.
A telephone keypad is a keypad installed on a push-button telephone or similar telecommunication device for dialing a telephone number. It was standardized when the dual-tone multi-frequency signaling (DTMF) system was developed in the Bell System in the United States in the 1960s – this replaced rotary dialing, that had been developed for ...
correct number placement: 13:37, 22 July 2017: 435 × 417 (3.67 MB) Psiĥedelisto: Overlayed new area code 640 over 609: 06:38, 16 January 2017: 408 × 391 (3.65 MB) Psiĥedelisto: fix wrong color of area code 609 barrier islands which was masked by outlines in previous version of image: 21:45, 3 December 2016: 408 × 391 (3.65 MB) Kbrose
The Bar Code Book – Roger C. Palmer, Helmers Publishing, ISBN 0-911261-09-5, 386 pages; The Bar Code Manual – Eugene F. Brighan, Thompson Learning, ISBN 0-03-016173-8; Handbook of Bar Coding Systems – Harry E. Burke, Van Nostrand Reinhold Company, ISBN 978-0-442-21430-2, 219 pages
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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]