BE522577A - - Google Patents
Info
- Publication number
- BE522577A BE522577A BE522577DA BE522577A BE 522577 A BE522577 A BE 522577A BE 522577D A BE522577D A BE 522577DA BE 522577 A BE522577 A BE 522577A
- Authority
- BE
- Belgium
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q3/00—Selecting arrangements
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Devices For Supply Of Signal Current (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR934954X | 1952-09-05 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| BE522577A true BE522577A (en:Method) |
Family
ID=9456478
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| BE522577D BE522577A (en:Method) | 1952-09-05 |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US2846513A (en:Method) |
| BE (1) | BE522577A (en:Method) |
| DE (1) | DE934954C (en:Method) |
| FR (1) | FR1062736A (en:Method) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1074662B (de) * | 1957-10-10 | 1960-02-04 | Pye Limited, Cambridge (Grossbritannien) | Automatisches Telefonsystem mit elektronischer Schaltung des Rufstromes zu einem Teilnehmer |
| US3350508A (en) * | 1964-12-10 | 1967-10-31 | Bell Telephone Labor Inc | Immediate ringing circuit for telephone systems |
| US3470533A (en) * | 1965-10-18 | 1969-09-30 | Northern Electric Co | Matrix switching of sources and control |
| US3752924A (en) * | 1971-11-10 | 1973-08-14 | Bell Telephone Labor Inc | Telephone subscriber line ring-trip detection circuit |
| US3904831A (en) * | 1974-01-09 | 1975-09-09 | Stromberg Carlson Corp | Tone control arrangement for electronic PABX |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2535675A (en) * | 1948-10-29 | 1950-12-26 | Bell Telephone Labor Inc | Ringing control circuit |
| US2714632A (en) * | 1949-12-20 | 1955-08-02 | Bell Telephone Labor Inc | Ringing generator and interrupter using electron tubes |
-
0
- BE BE522577D patent/BE522577A/xx unknown
-
1952
- 1952-09-05 FR FR1062736D patent/FR1062736A/fr not_active Expired
-
1953
- 1953-09-04 US US378448A patent/US2846513A/en not_active Expired - Lifetime
- 1953-09-05 DE DEI7664A patent/DE934954C/de not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| FR1062736A (fr) | 1954-04-27 |
| DE934954C (de) | 1955-11-10 |
| US2846513A (en) | 1958-08-05 |