JPS558860B2 - - Google Patents
Info
- Publication number
- JPS558860B2 JPS558860B2 JP15582876A JP15582876A JPS558860B2 JP S558860 B2 JPS558860 B2 JP S558860B2 JP 15582876 A JP15582876 A JP 15582876A JP 15582876 A JP15582876 A JP 15582876A JP S558860 B2 JPS558860 B2 JP S558860B2
- 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
- H04M1/70—Lock-out or secrecy arrangements in party-line systems
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 |
|---|---|---|---|
| JP15582876A JPS5379411A (en) | 1976-12-24 | 1976-12-24 | Privacy call device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15582876A JPS5379411A (en) | 1976-12-24 | 1976-12-24 | Privacy call device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5379411A JPS5379411A (en) | 1978-07-13 |
| JPS558860B2 true JPS558860B2 (OSRAM) | 1980-03-06 |
Family
ID=15614372
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15582876A Granted JPS5379411A (en) | 1976-12-24 | 1976-12-24 | Privacy call device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5379411A (OSRAM) |
-
1976
- 1976-12-24 JP JP15582876A patent/JPS5379411A/ja active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5379411A (en) | 1978-07-13 |