JPS567628B2 - - Google Patents
Info
- Publication number
- JPS567628B2 JPS567628B2 JP5749576A JP5749576A JPS567628B2 JP S567628 B2 JPS567628 B2 JP S567628B2 JP 5749576 A JP5749576 A JP 5749576A JP 5749576 A JP5749576 A JP 5749576A JP S567628 B2 JPS567628 B2 JP S567628B2
- 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 |
|---|---|---|---|
| JP5749576A JPS52141105A (en) | 1976-05-19 | 1976-05-19 | Privacy talk system for key telephone |
| 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 |
|---|---|---|---|
| JP5749576A JPS52141105A (en) | 1976-05-19 | 1976-05-19 | Privacy talk system for key telephone |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS52141105A JPS52141105A (en) | 1977-11-25 |
| JPS567628B2 true JPS567628B2 (OSRAM) | 1981-02-18 |
Family
ID=13057297
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5749576A Granted JPS52141105A (en) | 1975-12-26 | 1976-05-19 | Privacy talk system for key telephone |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS52141105A (OSRAM) |
-
1976
- 1976-05-19 JP JP5749576A patent/JPS52141105A/ja active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS52141105A (en) | 1977-11-25 |