NL67517C - - Google Patents
Info
- Publication number
- NL67517C NL67517C NL67517DA NL67517C NL 67517 C NL67517 C NL 67517C NL 67517D A NL67517D A NL 67517DA NL 67517 C NL67517 C NL 67517C
- 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
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q3/00—Selecting arrangements
- H04Q3/0016—Arrangements providing connection between exchanges
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Interface Circuits In Exchanges (AREA)
- Devices For Supply Of Signal Current (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL2647164X | 1947-04-24 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| NL67517C true NL67517C (en:Method) |
Family
ID=19875186
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NL67517D NL67517C (en:Method) | 1947-04-24 |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US2647164A (en:Method) |
| FR (1) | FR965255A (en:Method) |
| NL (1) | NL67517C (en:Method) |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1859476A (en) * | 1930-02-12 | 1932-05-24 | Western Electric Co | Semiautomatic telephone system |
| US1881273A (en) * | 1931-01-07 | 1932-10-04 | Western Electric Co | Telephone system |
| FR744153A (en:Method) * | 1931-11-07 | 1933-04-13 | ||
| FR815554A (fr) * | 1936-06-30 | 1937-07-16 | Siemens Ag | Système de téléphone automatique fonctionnant à l'aide de sélecteurs et d'enregistreurs |
| GB521419A (en) * | 1938-11-18 | 1940-05-21 | Siemens Brothers & Co Ltd | Improvements relating to telephone systems |
| US2332912A (en) * | 1942-05-01 | 1943-10-26 | Bell Telephone Labor Inc | Telephone system |
-
0
- NL NL67517D patent/NL67517C/xx active
- FR FR965255D patent/FR965255A/fr not_active Expired
-
1948
- 1948-04-22 US US22617A patent/US2647164A/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| US2647164A (en) | 1953-07-28 |
| FR965255A (en:Method) | 1950-09-07 |