CA512084A - Multi-office toll switching telephone systems - Google Patents

Multi-office toll switching telephone systems

Info

Publication number: CA512084A
Authority: CA; Canada
Prior art keywords: telephone systems; switching telephone; toll switching; office; office toll
Prior art date: 1955-04-19
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

CA512084A

Other languages

Inventor

W. Balzer Harvey

Original Assignee

Northern Electric Co Ltd

Publication date

1955-04-19

1955-04-19 Application granted granted Critical

1955-04-19 Publication of CA512084A publication Critical patent/CA512084A/en

Status Expired legal-status Critical Current

CA512084A Multi-office toll switching telephone systems Expired CA512084A (en)

Application Number	Priority Date	Filing Date	Title
CA512084T

Publication Number	Publication Date
CA512084A true CA512084A (en)	1955-04-19

Application Number	Title	Priority Date	Filing Date
CA512084A Expired CA512084A (en)			Multi-office toll switching telephone systems

Country	Link
CA (1)	CA512084A (en)

Publication	Publication Date	Title
US2868884A (en)	1959-01-13	Toll switching telephone system
CA518928A (en)	1955-11-29	Toll switching systems
CA519764A (en)	1955-12-20	Toll switching system
CA507729A (en)	1954-11-30	Toll switching telephone systems
CA507730A (en)	1954-11-30	Toll switching telephone systems
CA512519A (en)	1955-05-03	Party-line telephone systems
CA506632A (en)	1954-10-19	Telecommunication switching systems
CA512312A (en)	1955-04-26	Telephone systems
CA512310A (en)	1955-04-26	Telephone systems
CA510190A (en)	1955-02-15	Telephone systems
CA510665A (en)	1955-03-08	Telephone systems
CA511747A (en)	1955-04-12	Telephone systems
CA519014A (en)	1955-11-29	Telephone systems
CA512083A (en)	1955-04-19	Telephone systems
CA512311A (en)	1955-04-26	Telephone systems
CA512309A (en)	1955-04-26	Telephone systems
CA514094A (en)	1955-06-28	Telephone systems employing non-numerical switches
CA509711A (en)	1955-02-01	Switching systems
CA496550A (en)	1953-09-29	Telephone switching system
CA521240A (en)	1956-01-31	Toll switching systems
AU211198B2 (en)	1956-01-05	Improvements in telecommunication systems
CA565967A (en)	1958-11-11	Toll switching telephone systems
CA514091A (en)	1955-06-28	Telephone switchboard
CA513821A (en)	1955-06-14	Electronic register for telephone switching systems
CA562754A (en)	1958-09-02	Toll switching telephone system