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File:The Bell System technical journal 1952 Area Code map of USA.jpg

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Identifier: bell00systemvol31techniamerrich (find matches)
Title: The Bell System technical journal
Year: 1922 (1920s)
Authors: American Telephone and Telegraph Company
Subjects: Telecommunication Electric engineering Communication Electronics Science Technology
Publisher: (Short Hills, N.J., etc., American Telephone and Telegraph Co.)
Contributing Library: Prelinger Library
Digitizing Sponsor: Internet Archive

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Fig. J—Nationwide loll ili;iling luciis in tho UTiito<l Stales unci Ciiniula NATIONWIDE NUMBERING PLAN 859 in the customers local dialing area. For these offices with five or four-(litiit local dialing and for offices in the larger places served by certaint.\pes of dial equipment, as they are arranged today, it will be necessaryto prefix the dialing of toll calls by a transfer or directing code to permitthe customer getting from the local ofhce into the toll network. Independent of the adxantages of a universal 2-5 numbering planf(M- nationwide operator and customer toll dialing, the Bell System hasmade considcral)le progress in this direction over the past several years.\ew York antl Northern New Jersey adopted 2-5 numbering in 1930in order to take advantage of the flexibility of office code assignmentsand the large code capacity which this type of local numbering provides.Since World War II many cities and their environs such as Chicago,Boston, Philadelphia, San Francisco, Oakl

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作者 American Telephone and Telegraph Company
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InfoField
  • bookid:bell00systemvol31techniamerrich
  • bookyear:1922
  • bookdecade:1920
  • bookcentury:1900
  • bookauthor:American_Telephone_and_Telegraph_Company
  • booksubject:Telecommunication
  • booksubject:Electric_engineering
  • booksubject:Communication
  • booksubject:Electronics
  • booksubject:Science
  • booksubject:Technology
  • bookpublisher:_Short_Hills__N_J___etc___American_Telephone_and_Telegraph_Co__
  • bookcontributor:Prelinger_Library
  • booksponsor:Internet_Archive
  • bookleafnumber:889
  • bookcollection:prelinger_library
  • bookcollection:additional_collections
  • bookcollection:americana
  • BHL Collection
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2014年7月27日

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这幅图片原始出处为Flickr的https://flickr.com/photos/126377022@N07/14570186909 ，作者为Internet Archive Book Images 。经机器人FlickreviewR在2015年10月18日审查后确定为采用No known copyright restrictions的协议授权使用。

2015年10月18日

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September 1952 Bell System proposal for area codes in the eventual North American Numbering Plan.

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作者姓名字符串 简体中文（已转写）：​American Telephone and Telegraph Company

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档案可于互联网取用 繁体中文（已转写）

运营者：​Flickr
详情描述网址 简体中文（已转写）：​https://www.flickr.com/photos/internetarchivebookimages/14570186909

媒体类型 简体中文（已转写）

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