CA502772A - Automatic telephone billing system - Google Patents

Automatic telephone billing system

Info

Publication number
CA502772A
CA502772A CA502772A CA502772DA CA502772A CA 502772 A CA502772 A CA 502772A CA 502772 A CA502772 A CA 502772A CA 502772D A CA502772D A CA 502772DA CA 502772 A CA502772 A CA 502772A
Authority
CA
Canada
Prior art keywords
billing system
automatic telephone
telephone billing
automatic
telephone
Prior art date
Legal status (The legal status 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 status listed.)
Expired
Application number
CA502772A
Other languages
French (fr)
Inventor
E. Brooks Chester
W. Carpenter Warren
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
AT&T Corp
Original Assignee
Western Electric Co Inc
Publication date
Application granted granted Critical
Publication of CA502772A publication Critical patent/CA502772A/en
Expired legal-status Critical Current

Links

CA502772A Automatic telephone billing system Expired CA502772A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CA502772T

Publications (1)

Publication Number Publication Date
CA502772A true CA502772A (en) 1954-05-18

Family

ID=35648677

Family Applications (1)

Application Number Title Priority Date Filing Date
CA502772A Expired CA502772A (en) Automatic telephone billing system

Country Status (1)

Country Link
CA (1) CA502772A (en)

Similar Documents

Publication Publication Date Title
CA502772A (en) Automatic telephone billing system
CA500362A (en) Automatic telephone systems
CA500638A (en) Automatic telephone systems
CA503173A (en) Automatic telephone systems
CA505485A (en) Automatic telephone systems
CA501908A (en) Telephone receiving system
AU201965B2 (en) Improvements relating to automatic telephone systems
CA507479A (en) Automatic distributor
CA507871A (en) Telecommunication system
AU346754A (en) Improvements relating to automatic telephone systems
CA502238A (en) Telephone systems
CA499356A (en) Telephone systems
CA501321A (en) Telephone systems
CA502239A (en) Telephone systems
CA506411A (en) Telephone systems
CA507617A (en) Telephone systems
CA502236A (en) Telephone systems
CA509545A (en) Automatic telephone system
CA505876A (en) Telephone signaling system
CA507200A (en) Telecommunication systems
CA505804A (en) Telephone signalling system
CA500987A (en) Automatic accounting device
CA505237A (en) Automatic accounting device
CA505238A (en) Automatic accounting device
AU205869B2 (en) Improvements in automatic telephone exchange systems