NL257729A - - Google Patents
Info
- Publication number
- NL257729A NL257729A NL257729DA NL257729A NL 257729 A NL257729 A NL 257729A NL 257729D A NL257729D A NL 257729DA NL 257729 A NL257729 A NL 257729A
- Authority
- NL
- Netherlands
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/04—Selecting arrangements for multiplex systems for time-division multiplexing
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M19/00—Current supply arrangements for telephone systems
- H04M19/02—Current supply arrangements for telephone systems providing ringing current or supervisory tones, e.g. dialling tone or busy tone
- H04M19/04—Current supply arrangements for telephone systems providing ringing current or supervisory tones, e.g. dialling tone or busy tone the ringing-current being generated at the substations
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Devices For Supply Of Signal Current (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US862186A US3089001A (en) | 1959-12-28 | 1959-12-28 | Telephone ringing circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| NL257729A true NL257729A (US20040232935A1-20041125-M00001.png) |
Family
ID=25337875
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NL257729D NL257729A (US20040232935A1-20041125-M00001.png) | 1959-12-28 |
Country Status (6)
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3247327A (en) * | 1963-01-17 | 1966-04-19 | Northern Electric Co | Telephone signalling circuits |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2180334A (en) * | 1938-01-20 | 1939-11-21 | Bell Telephone Labor Inc | Signaling system |
| US2761909A (en) * | 1953-01-28 | 1956-09-04 | Bell Telephone Labor Inc | Multifrequency oscillator |
| US2824175A (en) * | 1954-11-18 | 1958-02-18 | Bell Telephone Labor Inc | Selective ringing circuits |
| US2957950A (en) * | 1954-11-18 | 1960-10-25 | Bell Telephone Labor Inc | Transistor selective ringing circuit |
| US2823266A (en) * | 1955-05-10 | 1958-02-11 | Gen Dynamics Corp | Subscriber line ringing in an electronic telephone system |
| NL106433C (US20040232935A1-20041125-M00001.png) * | 1955-11-14 |
-
0
- NL NL257729D patent/NL257729A/xx unknown
-
1959
- 1959-12-28 US US862186A patent/US3089001A/en not_active Expired - Lifetime
-
1960
- 1960-11-29 FR FR845337A patent/FR1282008A/fr not_active Expired
- 1960-12-07 GB GB42100/60A patent/GB965237A/en not_active Expired
- 1960-12-13 JP JP4844160A patent/JPS3818481B1/ja active Pending
- 1960-12-23 BE BE598493A patent/BE598493A/fr unknown
Also Published As
| Publication number | Publication date |
|---|---|
| BE598493A (fr) | 1961-04-14 |
| US3089001A (en) | 1963-05-07 |
| FR1282008A (fr) | 1962-01-19 |
| GB965237A (en) | 1964-07-29 |
| JPS3818481B1 (US20040232935A1-20041125-M00001.png) | 1963-09-16 |
