JPS53115106A - Button telephone set door phone call identifying circuit system - Google Patents

Button telephone set door phone call identifying circuit system

Info

Publication number
JPS53115106A
JPS53115106A JP2922677A JP2922677A JPS53115106A JP S53115106 A JPS53115106 A JP S53115106A JP 2922677 A JP2922677 A JP 2922677A JP 2922677 A JP2922677 A JP 2922677A JP S53115106 A JPS53115106 A JP S53115106A
Authority
JP
Japan
Prior art keywords
circuit system
telephone set
phone call
door phone
button telephone
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.)
Pending
Application number
JP2922677A
Other languages
Japanese (ja)
Inventor
Tadamichi Koike
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.)
Nakayo Telecommunications Inc
Original Assignee
Nakayo Telecommunications 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
Application filed by Nakayo Telecommunications Inc filed Critical Nakayo Telecommunications Inc
Priority to JP2922677A priority Critical patent/JPS53115106A/en
Publication of JPS53115106A publication Critical patent/JPS53115106A/en
Pending legal-status Critical Current

Links

Landscapes

  • Interconnected Communication Systems, Intercoms, And Interphones (AREA)
  • Sub-Exchange Stations And Push- Button Telephones (AREA)
JP2922677A 1977-03-18 1977-03-18 Button telephone set door phone call identifying circuit system Pending JPS53115106A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2922677A JPS53115106A (en) 1977-03-18 1977-03-18 Button telephone set door phone call identifying circuit system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2922677A JPS53115106A (en) 1977-03-18 1977-03-18 Button telephone set door phone call identifying circuit system

Publications (1)

Publication Number Publication Date
JPS53115106A true JPS53115106A (en) 1978-10-07

Family

ID=12270295

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2922677A Pending JPS53115106A (en) 1977-03-18 1977-03-18 Button telephone set door phone call identifying circuit system

Country Status (1)

Country Link
JP (1) JPS53115106A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5850550U (en) * 1981-09-30 1983-04-05 東芝ライテック株式会社 intercom device

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5139407B2 (en) * 1971-11-29 1976-10-27

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5139407B2 (en) * 1971-11-29 1976-10-27

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5850550U (en) * 1981-09-30 1983-04-05 東芝ライテック株式会社 intercom device

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