JPS53115106A - Button telephone set door phone call identifying circuit system - Google Patents
Button telephone set door phone call identifying circuit systemInfo
- 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
Links
Landscapes
- Interconnected Communication Systems, Intercoms, And Interphones (AREA)
- Sub-Exchange Stations And Push- Button Telephones (AREA)
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)
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)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5139407B2 (en) * | 1971-11-29 | 1976-10-27 |
-
1977
- 1977-03-18 JP JP2922677A patent/JPS53115106A/en active Pending
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5139407B2 (en) * | 1971-11-29 | 1976-10-27 |
Cited By (1)
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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