CA514584A - Tone frequency signalling system - Google Patents

Tone frequency signalling system

Info

Publication number
CA514584A
CA514584A CA514584A CA514584DA CA514584A CA 514584 A CA514584 A CA 514584A CA 514584 A CA514584 A CA 514584A CA 514584D A CA514584D A CA 514584DA CA 514584 A CA514584 A CA 514584A
Authority
CA
Canada
Prior art keywords
tone frequency
signalling system
frequency signalling
tone
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
CA514584A
Other languages
French (fr)
Inventor
Den Hertog Martinus
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 CA514584A publication Critical patent/CA514584A/en
Expired legal-status Critical Current

Links

CA514584A Tone frequency signalling system Expired CA514584A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CA514584T

Publications (1)

Publication Number Publication Date
CA514584A true CA514584A (en) 1955-07-12

Family

ID=35665673

Family Applications (1)

Application Number Title Priority Date Filing Date
CA514584A Expired CA514584A (en) Tone frequency signalling system

Country Status (1)

Country Link
CA (1) CA514584A (en)

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