CA604241A - Telephone signalling systems - Google Patents

Telephone signalling systems

Info

Publication number
CA604241A
CA604241A CA604241A CA604241DA CA604241A CA 604241 A CA604241 A CA 604241A CA 604241 A CA604241 A CA 604241A CA 604241D A CA604241D A CA 604241DA CA 604241 A CA604241 A CA 604241A
Authority
CA
Canada
Prior art keywords
signalling systems
telephone signalling
telephone
systems
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
CA604241A
Inventor
S. Leman Hugh
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 CA604241A publication Critical patent/CA604241A/en
Expired legal-status Critical Current

Links

CA604241A Telephone signalling systems Expired CA604241A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CA604241T

Publications (1)

Publication Number Publication Date
CA604241A true CA604241A (en) 1960-08-30

Family

ID=35825711

Family Applications (1)

Application Number Title Priority Date Filing Date
CA604241A Expired CA604241A (en) Telephone signalling systems

Country Status (1)

Country Link
CA (1) CA604241A (en)

Similar Documents

Publication Publication Date Title
CA692509A (en) Interrogator-responder signalling system
CA604241A (en) Telephone signalling systems
CA590349A (en) Telephone systems
CA594337A (en) Telephone systems
CA596906A (en) Telephone systems
CA599314A (en) Telephone systems
CA600785A (en) Telephone systems
CA602850A (en) Telephone systems
CA602931A (en) Telephone systems
CA606598A (en) Telephone systems
CA603504A (en) Signalling systems
CA593055A (en) Telephone system
CA609058A (en) Call-distributing telephone system
CA610884A (en) Telephone system
CA602623A (en) Telephone system
CA602132A (en) Telephone alarm system
CA606925A (en) Electrical signalling systems
CA596509A (en) Signalling system
CA594405A (en) Signaling system
CA600286A (en) Signaling system
CA593305A (en) Communication systems
CA605782A (en) Loud-speaking telephone systems
CA599262A (en) Party line telephone systems
CA590808A (en) Automatic telephone systems
AU256337B2 (en) Automatic telephone systems