GB1055633A - - Google Patents

Info

Publication number
GB1055633A
GB1055633A GB1055633DA GB1055633A GB 1055633 A GB1055633 A GB 1055633A GB 1055633D A GB1055633D A GB 1055633DA GB 1055633 A GB1055633 A GB 1055633A
Authority
GB
United Kingdom
Prior art keywords
relay
circuit
door
winding
stations
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.)
Active
Application number
Other languages
English (en)
Publication of GB1055633A publication Critical patent/GB1055633A/en
Active legal-status Critical Current

Links

Landscapes

  • Interconnected Communication Systems, Intercoms, And Interphones (AREA)
GB1055633D Active GB1055633A (enExample)

Publications (1)

Publication Number Publication Date
GB1055633A true GB1055633A (enExample)

Family

ID=1758464

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1055633D Active GB1055633A (enExample)

Country Status (1)

Country Link
GB (1) GB1055633A (enExample)

Similar Documents

Publication Publication Date Title
US3904834A (en) Handsfree loudspeaking key telephone set and a switching circuit for use in a microphone and loudspeaker equipped key telephone
US3254159A (en) Telephone adapter
GB1055633A (enExample)
US2200820A (en) Automatic telephone system
US2249156A (en) Telephone system
JPH0451111B2 (enExample)
US1325347A (en) Telephone system
US2897285A (en) Intercommunicating system
GB635644A (en) Improvements relating to telephone systems
SU1570025A1 (ru) Устройство громкоговор щей конференцсв зи
JPS6328554B2 (enExample)
GB677894A (en) Improvements in or relating to intercommunication telephone systems
US2644039A (en) Circuit arrangement for conference call installations
US2238070A (en) Broadcast switching system
US2848552A (en) Loud-speaking station for automatic telephone systems
US1325871A (en) Chables w
GB597893A (en) Loud speaking telephone systems
GB701947A (enExample)
US809929A (en) Intercommunication telephone system.
US2254723A (en) Subscriber line circuit
KR920002956B1 (ko) 사설교환기에 있어서 교환대의 유선방송 및 응답방법 및 회로
JPH0122797B2 (enExample)
JP2815878B2 (ja) 家庭用簡易電話交換装置
JPS5910832Y2 (ja) コ−ドレス電話装置
US1870471A (en) Telephone system