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Publication numberUS2688658 A
Publication typeGrant
Publication dateSep 7, 1954
Filing dateJul 7, 1947
Priority dateJul 7, 1947
Publication numberUS 2688658 A, US 2688658A, US-A-2688658, US2688658 A, US2688658A
InventorsCarpenter Warren W, Collis Raymond E
Original AssigneeBell Telephone Labor Inc
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Call data recording telephone system
US 2688658 A
Abstract  available in
Description  available in
Claims  available in
Patent Citations
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Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2794070 *Jan 22, 1951May 28, 1957Gen Telephone Lab IncTape perforating machines for toll ticketing telephone systems
US2848543 *Oct 19, 1954Aug 19, 1958Bell Telephone Labor IncCall data recording telephone system
US2955163 *Apr 3, 1957Oct 4, 1960Gen Telephone Lab IncAutomatic toll ticketing telephone system
US3012711 *Dec 30, 1957Dec 12, 1961IbmTelephone dial controlled perforator
US3046342 *Apr 3, 1957Jul 24, 1962Automatic Elect LabAutomatic toll ticketing telephone system
US3196401 *Mar 25, 1960Jul 20, 1965Bell Telephone Labor IncData identity generator
US4056698 *Apr 20, 1976Nov 1, 1977Bell Telephone Laboratories, IncorporatedSpecial automatic trunk testing arrangement
US4147902 *May 6, 1977Apr 3, 1979Bell Telephone Laboratories, IncorporatedMethod of automatic trunk testing
U.S. Classification379/119, 346/146, 346/80, 379/114.1, 346/50
International ClassificationH04M15/04
Cooperative ClassificationH04M15/04
European ClassificationH04M15/04