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- Telephone_exchange_names abstract "A telephone exchange name was a distinguishing and memorable name assigned to a telephone exchange. In multi-exchange service areas, exchange names identified the central office to which a telephone was connected. Each exchange served a maximum of 10,000 subscriber lines identified by the last four digits of the telephone number. Areas or cities with more subscribers were served by multiple exchanges, possibly hosted in the same central office building. Abbreviations of the exchange names were used as leading components of telephone numbers, so that each telephone number in an area was unique.In exchange areas with dial service, the leading letters of exchange names were mapped to digits. The letters were typically displayed on the telephone dial by grouping the letters around each digit. Several systematic coding schemes for telephone numbers existed in various communities, sometimes evolving over time as the subscriber base outgrew older telephone numbering plans. A widely used numbering plan was a system of using two letters from the exchange name with five digits, which was designated as 2L-5N. In 1917, W. G. Blauvelt of AT&T proposed a mapping system that displayed three letters above the digits 2 through 9 on the dial.Telephone directories or any other telephone number displays typically listed the telephone number showing the significant letters of the exchange name in bold capital letters, followed by the digits that identified the subscriber line.On the telephone instrument's number card, the exchange name was typically shown in full, but only the significant letters were capitalized, while the rest of the name was shown in lower case, or as small caps (as TAylor 4725).The system of telephone exchange names was over time retired after the introduction of area codes in the United States and other similar all-number calling systems around the world, such as the British all-figure dialling.".
- Telephone_exchange_names wikiPageExternalLink nond1955.pdf.
- Telephone_exchange_names wikiPageExternalLink Recommended.html.
- Telephone_exchange_names wikiPageExternalLink TENproject.html.
- Telephone_exchange_names wikiPageExternalLink numbers.html.
- Telephone_exchange_names wikiPageExternalLink showthread.php?t=5412.
- Telephone_exchange_names wikiPageID "2201331".
- Telephone_exchange_names wikiPageRevisionID "603364992".
- Telephone_exchange_names hasPhotoCollection Telephone_exchange_names.
- Telephone_exchange_names subject Category:Telephone_numbers.
- Telephone_exchange_names type Abstraction100002137.
- Telephone_exchange_names type Communication100033020.
- Telephone_exchange_names type PhoneNumber106426111.
- Telephone_exchange_names type Signal106791372.
- Telephone_exchange_names type TelephoneNumbers.
- Telephone_exchange_names comment "A telephone exchange name was a distinguishing and memorable name assigned to a telephone exchange. In multi-exchange service areas, exchange names identified the central office to which a telephone was connected. Each exchange served a maximum of 10,000 subscriber lines identified by the last four digits of the telephone number. Areas or cities with more subscribers were served by multiple exchanges, possibly hosted in the same central office building.".
- Telephone_exchange_names label "Telephone exchange names".
- Telephone_exchange_names sameAs m.06vhj0.
- Telephone_exchange_names sameAs Q17163306.
- Telephone_exchange_names sameAs Q17163306.
- Telephone_exchange_names sameAs Telephone_exchange_names.
- Telephone_exchange_names wasDerivedFrom Telephone_exchange_names?oldid=603364992.
- Telephone_exchange_names homepage Recommended.html.
- Telephone_exchange_names isPrimaryTopicOf Telephone_exchange_names.