JPS5440403B2 - - Google Patents
Info
- Publication number
- JPS5440403B2 JPS5440403B2 JP15672475A JP15672475A JPS5440403B2 JP S5440403 B2 JPS5440403 B2 JP S5440403B2 JP 15672475 A JP15672475 A JP 15672475A JP 15672475 A JP15672475 A JP 15672475A JP S5440403 B2 JPS5440403 B2 JP S5440403B2
- Authority
- JP
- Japan
- 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
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 (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15672475A JPS5279705A (en) | 1975-12-26 | 1975-12-26 | Privacy circuit in key telephone unit |
| US05/967,017 US4254306A (en) | 1975-12-26 | 1978-12-06 | Key telephone system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15672475A JPS5279705A (en) | 1975-12-26 | 1975-12-26 | Privacy circuit in key telephone unit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5279705A JPS5279705A (en) | 1977-07-05 |
| JPS5440403B2 true JPS5440403B2 (pm) | 1979-12-03 |
Family
ID=15633935
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15672475A Granted JPS5279705A (en) | 1975-12-26 | 1975-12-26 | Privacy circuit in key telephone unit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5279705A (pm) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS52104008A (en) * | 1976-02-27 | 1977-09-01 | Taiko Denki Seisakusho:Kk | Connecting method of button telephone apparatus |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4926241A (pm) * | 1972-07-12 | 1974-03-08 | ||
| JPS539803B2 (pm) * | 1973-01-13 | 1978-04-08 |
-
1975
- 1975-12-26 JP JP15672475A patent/JPS5279705A/ja active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5279705A (en) | 1977-07-05 |