CA466372A - Telephone alarm call system - Google Patents

Telephone alarm call system

Info

Publication number: CA466372A
Authority: CA; Canada
Prior art keywords: call system; alarm call; telephone alarm; telephone; call
Prior art date: 1950-07-04
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

CA466372A

Other languages

Inventor

E. Lomax Clarence

Original Assignee

Northern Electric Co Ltd

Publication date

1950-07-04

1950-07-04 Application granted granted Critical

1950-07-04 Publication of CA466372A publication Critical patent/CA466372A/en

Status Expired legal-status Critical Current

CA466372A Telephone alarm call system Expired CA466372A (en)

Application Number	Priority Date	Filing Date	Title
CA466372T

Publication Number	Publication Date
CA466372A true CA466372A (en)	1950-07-04

Application Number	Title	Priority Date	Filing Date
CA466372A Expired CA466372A (en)			Telephone alarm call system

Country	Link
CA (1)	CA466372A (en)

Publication	Publication Date	Title
CA466372A (en)	1950-07-04	Telephone alarm call system
CA462640A (en)	1950-01-24	Telephone system
CA462890A (en)	1950-01-31	Telephone system
CA465294A (en)	1950-05-23	Telephone system
CA467358A (en)	1950-08-15	Telephone systems
CA468167A (en)	1950-09-19	Telephone systems
CA468566A (en)	1950-10-03	Telephone call transmitters
CA464612A (en)	1950-04-25	Telephone or like signalling system
CA463923A (en)	1950-03-21	Telephone call transmitter
CA471939A (en)	1951-03-06	Telephone call box systems
CA467438A (en)	1950-08-15	Telephone and like signalling systems
CA474041A (en)	1951-05-29	Telephone call intercepting systems
CA462927A (en)	1950-01-31	Loudspeaking communication system
CA465588A (en)	1950-05-30	Call recording system
CA470842A (en)	1951-01-16	Telephone systems
CA472098A (en)	1951-03-13	Telephone systems
CA476517A (en)	1951-08-28	Telephone systems
CA477986A (en)	1951-10-23	Telephone systems
CA453798A (en)	1949-01-04	Telephone system
CA454136A (en)	1949-01-18	Telephone system
CA454334A (en)	1949-01-25	Telephone system
CA455720A (en)	1949-04-05	Telephone system
CA456764A (en)	1949-05-17	Telephone system
CA457823A (en)	1949-07-05	Telephone system
CA457980A (en)	1949-07-05	Telephone system