CA574965A - Telephone systems - Google Patents

Telephone systems

Info

Publication number: CA574965A
Authority: CA; Canada
Prior art keywords: telephone systems; telephone; systems
Prior art date: 1959-04-28
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

CA574965A

Other languages

Inventor

A. Gulbrandsen Christian

Original Assignee

Northern Electric Co Ltd

Publication date

1959-04-28

1959-04-28 Application granted granted Critical

1959-04-28 Publication of CA574965A publication Critical patent/CA574965A/en

Status Expired legal-status Critical Current

CA574965A Telephone systems Expired CA574965A (en)

Application Number	Priority Date	Filing Date	Title
CA574965T

Publication Number	Publication Date
CA574965A true CA574965A (en)	1959-04-28

Application Number	Title	Priority Date	Filing Date
CA574965A Expired CA574965A (en)			Telephone systems

Country	Link
CA (1)	CA574965A (en)

Publication	Publication Date	Title
CA574965A (en)	1959-04-28	Telephone systems
CA572855A (en)	1959-03-24	Telephone systems
CA581156A (en)	1959-08-11	Telephone systems
CA587164A (en)	1959-11-17	Telephone systems
CA588334A (en)	1959-12-08	Telephone systems
CA571078A (en)	1959-02-24	Telephone system
CA587357A (en)	1959-11-17	Telecommunication systems
CA584528A (en)	1959-10-06	Telephone or like systems
CA571586A (en)	1959-03-03	House telephone systems
CA583967A (en)	1959-09-29	Intercommunication telephone systems
CA569198A (en)	1959-01-20	Automatic telephone systems
CA578982A (en)	1959-07-07	Automatic telephone systems
CA583278A (en)	1959-09-15	Automatic telephone systems
CA584006A (en)	1959-09-29	Automatic telephone systems
CA584178A (en)	1959-09-29	Automatic telephone systems
CA585771A (en)	1959-10-27	Automatic telephone systems
CA586768A (en)	1959-11-10	Automatic telephone systems
CA587624A (en)	1959-11-24	Automatic telephone systems
CA584188A (en)	1959-09-29	Multiple-feedback systems
AU231260B2 (en)	1959-08-13	Improvements in telephone systems
AU235231B2 (en)	1959-09-24	Improvements in telephone systems
CA577767A (en)	1959-06-16	Multiparty telephone system
CA571024A (en)	1959-02-24	Telephone alarm system
CA572016A (en)	1959-03-10	Electronic telephone system
CA566172A (en)	1958-11-18	Telephone systems