JPS5493905A - Speech circuit for key telephone system - Google Patents
Speech circuit for key telephone systemInfo
- Publication number
- JPS5493905A JPS5493905A JP42678A JP42678A JPS5493905A JP S5493905 A JPS5493905 A JP S5493905A JP 42678 A JP42678 A JP 42678A JP 42678 A JP42678 A JP 42678A JP S5493905 A JPS5493905 A JP S5493905A
- Authority
- JP
- Japan
- Prior art keywords
- main wire
- relay
- terminal
- pushed
- button
- 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
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/68—Circuit arrangements for preventing eavesdropping
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Sub-Exchange Stations And Push- Button Telephones (AREA)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP42678A JPS5493905A (en) | 1978-01-06 | 1978-01-06 | Speech circuit for key telephone system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP42678A JPS5493905A (en) | 1978-01-06 | 1978-01-06 | Speech circuit for key telephone system |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5493905A true JPS5493905A (en) | 1979-07-25 |
Family
ID=11473472
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP42678A Pending JPS5493905A (en) | 1978-01-06 | 1978-01-06 | Speech circuit for key telephone system |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5493905A (ja) |
-
1978
- 1978-01-06 JP JP42678A patent/JPS5493905A/ja active Pending
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