FR959395A - - Google Patents
Info
- Publication number
- FR959395A FR959395A FR959395DA FR959395A FR 959395 A FR959395 A FR 959395A FR 959395D A FR959395D A FR 959395DA FR 959395 A FR959395 A FR 959395A
- Authority
- FR
- France
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
-
- 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
- H04Q1/446—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using one signalling frequency
- H04Q1/4465—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using one signalling frequency the same frequency being used for all signalling information, e.g. A.C. nr.9 system
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Devices For Supply Of Signal Current (AREA)
- Sub-Exchange Stations And Push- Button Telephones (AREA)
- Interface Circuits In Exchanges (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US599537A US2422700A (en) | 1945-06-15 | 1945-06-15 | Reciprocal signaling trunk telephone system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| FR959395A true FR959395A (it) | 1950-03-29 |
Family
ID=24400029
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| FR959395D Expired FR959395A (it) | 1945-06-15 |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US2422700A (it) |
| BE (1) | BE479847A (it) |
| CH (1) | CH281613A (it) |
| FR (1) | FR959395A (it) |
| GB (1) | GB640108A (it) |
| NL (1) | NL78127C (it) |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1512907A (en) * | 1924-10-28 | Assig-nor to western electric com | ||
| US1449644A (en) * | 1919-12-30 | 1923-03-27 | Western Electric Co | Telephone system |
| US2005836A (en) * | 1933-08-29 | 1935-06-25 | American Telephone & Telegraph | Signaling system |
| GB567049A (en) * | 1943-07-21 | 1945-01-25 | Automatic Telephone & Elect | Improvements in telephone or like signalling systems |
-
0
- BE BE479847D patent/BE479847A/xx unknown
- NL NL78127D patent/NL78127C/xx active
- FR FR959395D patent/FR959395A/fr not_active Expired
-
1945
- 1945-06-15 US US599537A patent/US2422700A/en not_active Expired - Lifetime
-
1947
- 1947-12-13 CH CH281613D patent/CH281613A/de unknown
-
1948
- 1948-02-20 GB GB5098/48A patent/GB640108A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| US2422700A (en) | 1947-06-24 |
| GB640108A (en) | 1950-07-12 |
| CH281613A (de) | 1952-03-15 |
| BE479847A (it) | |
| NL78127C (it) |