CA505804A - Telephone signalling system - Google Patents

Telephone signalling system

Info

Publication number
CA505804A
CA505804A CA505804A CA505804DA CA505804A CA 505804 A CA505804 A CA 505804A CA 505804 A CA505804 A CA 505804A CA 505804D A CA505804D A CA 505804DA CA 505804 A CA505804 A CA 505804A
Authority
CA
Canada
Prior art keywords
signalling system
telephone signalling
telephone
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
CA505804A
Other languages
French (fr)
Inventor
H. Ransom David
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 CA505804A publication Critical patent/CA505804A/en
Expired legal-status Critical Current

Links

CA505804A Telephone signalling system Expired CA505804A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CA505804T

Publications (1)

Publication Number Publication Date
CA505804A true CA505804A (en) 1954-09-14

Family

ID=35651727

Family Applications (1)

Application Number Title Priority Date Filing Date
CA505804A Expired CA505804A (en) Telephone signalling system

Country Status (1)

Country Link
CA (1) CA505804A (en)

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