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The original North American area codes were established by the American Telephone & Telegraph Company (AT&T) in the years immediately following World War II. Creating a comprehensive and universal, continent-wide telephone numbering plan was a basic requirement for nationwide Operator Toll Dialing which had the goal of speeding the connecting times for long-distance calling by eliminating intermediary telephone operators. It had the eventual benefit of direct distance dialing (DDD) by telephone subscribers. It established a uniform destination addressing and call routing system for all telephone networks in North America that had become an essential public service.

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  • Original North American area codes (en)
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  • The original North American area codes were established by the American Telephone & Telegraph Company (AT&T) in the years immediately following World War II. Creating a comprehensive and universal, continent-wide telephone numbering plan was a basic requirement for nationwide Operator Toll Dialing which had the goal of speeding the connecting times for long-distance calling by eliminating intermediary telephone operators. It had the eventual benefit of direct distance dialing (DDD) by telephone subscribers. It established a uniform destination addressing and call routing system for all telephone networks in North America that had become an essential public service. (en)
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  • http://commons.wikimedia.org/wiki/Special:FilePath/NANP_area_code_handbook_Bell_Telephone_Pennsylvania_May_1962.png
  • http://commons.wikimedia.org/wiki/Special:FilePath/North_American_Numbering_Plan_NPA_map_BTM_1947.png
  • http://commons.wikimedia.org/wiki/Special:FilePath/US-NJ-AtlanticCity-numbercard-c1948.png
  • http://commons.wikimedia.org/wiki/Special:FilePath/US-NJ-LAkewood2697-bell-system-telephone-number-rotary-dial-1940.jpg
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