JPS5317442B2 - - Google Patents
Info
- Publication number
- JPS5317442B2 JPS5317442B2 JP2863274A JP2863274A JPS5317442B2 JP S5317442 B2 JPS5317442 B2 JP S5317442B2 JP 2863274 A JP2863274 A JP 2863274A JP 2863274 A JP2863274 A JP 2863274A JP S5317442 B2 JPS5317442 B2 JP S5317442B2
- 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
- H04M9/00—Arrangements for interconnection not involving centralised switching
- H04M9/002—Arrangements for interconnection not involving centralised switching with subscriber controlled access to a line, i.e. key telephone systems
- H04M9/003—Transmission of control signals from or to the key telephone set; signalling equipment at key telephone set, e.g. keyboard or display equipment
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Sub-Exchange Stations And Push- Button Telephones (AREA)
- Interconnected Communication Systems, Intercoms, And Interphones (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US341201A US3887774A (en) | 1973-03-14 | 1973-03-14 | Transistor switching circuit for use in a telephone system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS49124906A JPS49124906A (ja) | 1974-11-29 |
| JPS5317442B2 true JPS5317442B2 (ja) | 1978-06-08 |
Family
ID=23336616
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2863274A Expired JPS5317442B2 (ja) | 1973-03-14 | 1974-03-14 |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US3887774A (ja) |
| JP (1) | JPS5317442B2 (ja) |
| CA (1) | CA994487A (ja) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5526045U (ja) * | 1978-08-07 | 1980-02-20 |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5184504A (ja) * | 1975-01-21 | 1976-07-23 | Iwatsu Electric Co Ltd | |
| US4035588A (en) * | 1976-05-28 | 1977-07-12 | Gte Automatic Electric Laboratories Incorporated | Right-of-way control circuit for key telephone intercommunication system |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3293370A (en) * | 1963-12-30 | 1966-12-20 | American Telephone & Telegraph | Make busy line circuit for key telephone systems |
| US3535461A (en) * | 1967-12-15 | 1970-10-20 | Stromberg Carlson Corp | Busy detector circuit for step-by-step telephone exchange |
| US3691310A (en) * | 1970-12-21 | 1972-09-12 | Bell Telephone Labor Inc | Busy and talking link allotter circuit for electronic key telephone system |
| US3766325A (en) * | 1971-09-13 | 1973-10-16 | Lordel Mfg Co | Control circuits for key telephone system |
-
1973
- 1973-03-14 US US341201A patent/US3887774A/en not_active Expired - Lifetime
- 1973-11-26 CA CA186,725A patent/CA994487A/en not_active Expired
-
1974
- 1974-03-14 JP JP2863274A patent/JPS5317442B2/ja not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5526045U (ja) * | 1978-08-07 | 1980-02-20 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS49124906A (ja) | 1974-11-29 |
| CA994487A (en) | 1976-08-03 |
| US3887774A (en) | 1975-06-03 |