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Bell System Technical Journal Index with Links - 1922 - 1983
Bell System Technical Journal Archive Complete Index with hotlinks This page provides a convenient portal into the full run of the "BSTJ" articles from 1922-1983 posted by Bell Labs on archive.org. That site provides a subject / keyword search, on-line...
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60jan BSTJ p235 - Pushbutton Callilng with a Two-Group Voice Frequency Code
By L. SCHENKER. "A customer voice frequency pushbutton signaling scheme involving a new two group signal code, termed "four by four", is described. It is shown that the use of this code, with judiciously chosen frequencies, permits the detection of...
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60jul BSTJ p995 - Design and Use of Pushbutton Tel Sets
Human Factors Engineering Studies of the Design and Use of Pushbutton Telephone Sets by R. L. DEININGER. July, 1960. Describes 18 pushbutton layouts tested. "Technological progress in recent years has brought pushbutton signaling from the telephone set...
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Telephone Collectors International was incorporated under the laws of the state of Kansas on May 13, 1986. The goal of the organization is "to educate the public, as well as the members of the Corporation, regarding the history of telephony, the value of old telephones and related items, their collectability and preservation; to research telephone history and publish and provide literature thereon; to promote the public exhibition of old telephones and related items; and to promote common courtesies and guidelines for use by the public." Telephone Collectors International is recognized by the Internal Revenue Service as a 501(c)(3) organization, to which U.S. tax deductible contributions can be made.