Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from FR846060Aexternal-prioritypatent/FR79610E/en
Application filed by Bell Telephone MfgfiledCriticalBell Telephone Mfg
Application grantedgrantedCritical
Publication of BE611170RpublicationCriticalpatent/BE611170R/en
H04M15/00—Arrangements for metering, time-control or time indication ; Metering, charging or billing arrangements for voice wireline or wireless communications, e.g. VoIP
H04M15/04—Recording calls, or communications in printed, perforated or other permanent form
Landscapes
Engineering & Computer Science
(AREA)
Computer Networks & Wireless Communication
(AREA)
Signal Processing
(AREA)
Cash Registers Or Receiving Machines
(AREA)
BE611170A1960-12-061961-12-06
Improvements to telephone systems
BE611170R
(en)