CA993128A - Telephone call loudspeaker monitoring and relay control circuit - Google Patents

Telephone call loudspeaker monitoring and relay control circuit

Info

Publication number
CA993128A
CA993128A CA186,716A CA186716A CA993128A CA 993128 A CA993128 A CA 993128A CA 186716 A CA186716 A CA 186716A CA 993128 A CA993128 A CA 993128A
Authority
CA
Canada
Prior art keywords
control circuit
telephone call
relay control
call loudspeaker
loudspeaker monitoring
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
CA186,716A
Inventor
Stephen E. Kerman
Mikihiro Ichikawa
Kazuyuki Gotoh
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.)
Nippon Tsushin Kogyo KK
Tie Communications Inc
Original Assignee
Nippon Tsushin Kogyo KK
Tie Communications Inc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority claimed from JP1479773U external-priority patent/JPS49117430U/ja
Priority claimed from US348286A external-priority patent/US3881069A/en
Application filed by Nippon Tsushin Kogyo KK, Tie Communications Inc filed Critical Nippon Tsushin Kogyo KK
Application granted granted Critical
Publication of CA993128A publication Critical patent/CA993128A/en
Expired legal-status Critical Current

Links

CA186,716A 1973-02-05 1973-11-26 Telephone call loudspeaker monitoring and relay control circuit Expired CA993128A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP1479773U JPS49117430U (en) 1973-02-05 1973-02-05
US348286A US3881069A (en) 1973-04-05 1973-04-05 Telephone call loudspeaker monitoring and relay control circuit

Publications (1)

Publication Number Publication Date
CA993128A true CA993128A (en) 1976-07-13

Family

ID=26350819

Family Applications (1)

Application Number Title Priority Date Filing Date
CA186,716A Expired CA993128A (en) 1973-02-05 1973-11-26 Telephone call loudspeaker monitoring and relay control circuit

Country Status (1)

Country Link
CA (1) CA993128A (en)

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