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When the Bell System and AT T introduced the North American Numbering Plan in October 1947, area code 312 was designated as one of the original eighty-six foundation numbering plan areas, serving the entire northeastern Visit Metropolitan Telephony Topography and MultiCode Overlay Engineering Th (https://ancienttypewriters.de/index.php?title=Metropolitan_Telephony_Topography_and_MultiCode_Overlay_Engineering_The_Chicago_Area_Code_Framework)
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