CA517169A - Voice frequency signalling system - Google Patents

Voice frequency signalling system

Info

Publication number
CA517169A
CA517169A CA517169A CA517169DA CA517169A CA 517169 A CA517169 A CA 517169A CA 517169 A CA517169 A CA 517169A CA 517169D A CA517169D A CA 517169DA CA 517169 A CA517169 A CA 517169A
Authority
CA
Canada
Prior art keywords
voice frequency
signalling system
frequency signalling
voice
signalling
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
CA517169A
Other languages
French (fr)
Inventor
P. G. Wright Esmond
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.)
International Standard Electric Corp
Original Assignee
International Standard Electric Corp
Publication date
Application granted granted Critical
Publication of CA517169A publication Critical patent/CA517169A/en
Expired legal-status Critical Current

Links

CA517169A Voice frequency signalling system Expired CA517169A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CA517169T

Publications (1)

Publication Number Publication Date
CA517169A true CA517169A (en) 1955-10-04

Family

ID=35670363

Family Applications (1)

Application Number Title Priority Date Filing Date
CA517169A Expired CA517169A (en) Voice frequency signalling system

Country Status (1)

Country Link
CA (1) CA517169A (en)

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