NL75784C - - Google Patents
Info
- Publication number
- NL75784C NL75784C NL75784DA NL75784C NL 75784 C NL75784 C NL 75784C NL 75784D A NL75784D A NL 75784DA NL 75784 C NL75784 C NL 75784C
- Authority
- NL
- Netherlands
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)
- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
- Noise Elimination (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB18161/47A GB651464A (en) | 1947-07-09 | 1947-07-09 | Improvements in or relating to voice frequency signalling receivers |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| NL75784C true NL75784C (fr) |
Family
ID=10107688
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NL75784D NL75784C (fr) | 1947-07-09 |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US2572074A (fr) |
| BE (1) | BE486300A (fr) |
| CH (1) | CH268995A (fr) |
| FR (1) | FR980088A (fr) |
| GB (1) | GB651464A (fr) |
| NL (1) | NL75784C (fr) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2677014A (en) * | 1950-06-29 | 1954-04-27 | Westinghouse Electric Corp | Tone-shift carrier |
| US2817828A (en) * | 1953-10-07 | 1957-12-24 | Bell Telephone Labor Inc | Multifrequency high speed signaling system employing pulses of signaling currents ofpredetermined duration based on orthogonal functions |
| US2913711A (en) * | 1954-10-15 | 1959-11-17 | Itt | Signal control system |
| US2779935A (en) * | 1955-03-21 | 1957-01-29 | Holmes Electric Protective Com | Noise actuated disabling unit |
| US3124658A (en) * | 1958-02-28 | 1964-03-10 | Input | |
| US3204045A (en) * | 1962-10-30 | 1965-08-31 | Collins Radio Co | Automatic ring thru system |
| FR2506544A1 (fr) * | 1981-05-19 | 1982-11-26 | Jeumont Schneider | Procede de determination de l'etat d'un signal alternatif module en tout ou rien en milieu perturbe |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BE431048A (fr) * | 1937-11-12 | |||
| US2255190A (en) * | 1939-02-18 | 1941-09-09 | Ryall Leonard Ernest | Variable amplifying device |
| US2282131A (en) * | 1940-01-12 | 1942-05-05 | Associated Electric Lab Inc | Electrical signaling system |
-
0
- NL NL75784D patent/NL75784C/xx active
- BE BE486300D patent/BE486300A/xx unknown
-
1947
- 1947-07-09 GB GB18161/47A patent/GB651464A/en not_active Expired
-
1948
- 1948-07-07 US US37436A patent/US2572074A/en not_active Expired - Lifetime
- 1948-12-02 CH CH268995D patent/CH268995A/de unknown
- 1948-12-09 FR FR980088D patent/FR980088A/fr not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| FR980088A (fr) | 1951-05-08 |
| US2572074A (en) | 1951-10-23 |
| BE486300A (fr) | |
| GB651464A (en) | 1951-04-04 |
| CH268995A (de) | 1950-06-15 |