BE499154A - - Google Patents
Info
- Publication number
- BE499154A BE499154A BE499154DA BE499154A BE 499154 A BE499154 A BE 499154A BE 499154D A BE499154D A BE 499154DA BE 499154 A BE499154 A BE 499154A
- Authority
- BE
- Belgium
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q1/00—Details of selecting apparatus or arrangements
- H04Q1/18—Electrical details
- H04Q1/30—Signalling arrangements; Manipulation of signalling currents
- H04Q1/44—Signalling arrangements; Manipulation of signalling currents using alternate current
- H04Q1/444—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies
- H04Q1/45—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Interface Circuits In Exchanges (AREA)
- Monitoring And Testing Of Exchanges (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US125809A US2610256A (en) | 1949-11-05 | 1949-11-05 | Dial set for carrier or 2-wire lines |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| BE499154A true BE499154A (fr) |
Family
ID=22421517
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| BE499154D BE499154A (fr) | 1949-11-05 |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US2610256A (fr) |
| BE (1) | BE499154A (fr) |
| CH (1) | CH304203A (fr) |
| DE (1) | DE856907C (fr) |
| FR (1) | FR1031625A (fr) |
| GB (1) | GB680746A (fr) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB680521A (en) * | 1947-07-10 | 1952-10-08 | Automatic Elect Lab | Toll switching telephone system |
| US2754369A (en) * | 1953-10-23 | 1956-07-10 | T S Skillman And Company Pty L | Signalling arrangements for telephone systems |
| US3066195A (en) * | 1958-09-15 | 1962-11-27 | Gen Dynamics Corp | Signal transmitting and receiving station |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US199007A (en) * | 1878-01-08 | Improvement in telephones | ||
| US1688453A (en) * | 1926-05-19 | 1928-10-23 | American Telephone & Telegraph | Telephone signaling system |
| US2131164A (en) * | 1934-11-27 | 1938-09-27 | Csf | Remote selective control system |
| US2433281A (en) * | 1941-04-12 | 1947-12-23 | Farnsworth Res Corp | Radio communication checking system |
| US2438902A (en) * | 1943-10-04 | 1948-04-06 | Standard Telephones Cables Ltd | Pulse multiplex system employing fixed pulse-time displacement for signaling |
| US2408878A (en) * | 1945-02-28 | 1946-10-08 | Gen Railway Signal Co | Communication system |
| BE465290A (fr) * | 1945-04-30 | |||
| US2454498A (en) * | 1947-02-20 | 1948-11-23 | Gen Telephone Corp | Signaling and control system for carrier telephone trunk circuits |
-
0
- BE BE499154D patent/BE499154A/xx unknown
-
1949
- 1949-11-05 US US125809A patent/US2610256A/en not_active Expired - Lifetime
-
1950
- 1950-10-27 GB GB26220/50A patent/GB680746A/en not_active Expired
- 1950-11-03 FR FR1031625D patent/FR1031625A/fr not_active Expired
- 1950-11-04 DE DEI3472A patent/DE856907C/de not_active Expired
- 1950-11-04 CH CH304203D patent/CH304203A/de unknown
Also Published As
| Publication number | Publication date |
|---|---|
| GB680746A (en) | 1952-10-08 |
| FR1031625A (fr) | 1953-06-25 |
| DE856907C (de) | 1952-11-24 |
| CH304203A (de) | 1954-12-31 |
| US2610256A (en) | 1952-09-09 |