BE379502A - - Google Patents
Info
- Publication number
- BE379502A BE379502A BE379502DA BE379502A BE 379502 A BE379502 A BE 379502A BE 379502D A BE379502D A BE 379502DA BE 379502 A BE379502 A BE 379502A
- 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
- H04Q1/446—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)
- Telephonic Communication Services (AREA)
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR714908T | 1931-04-07 | ||
| GB10530/31A GB372066A (en) | 1931-04-07 | 1931-04-09 | Improvements in telephone systems |
| BE379502T | 1931-05-01 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| BE379502A true BE379502A (en。) | 1931-06-30 |
Family
ID=40498641
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| BE379502D BE379502A (en。) | 1931-04-07 | 1931-05-01 |
Country Status (3)
| Country | Link |
|---|---|
| BE (1) | BE379502A (en。) |
| FR (1) | FR714908A (en。) |
| GB (1) | GB372066A (en。) |
-
1931
- 1931-04-07 FR FR714908D patent/FR714908A/fr not_active Expired
- 1931-04-09 GB GB10530/31A patent/GB372066A/en not_active Expired
- 1931-05-01 BE BE379502D patent/BE379502A/xx unknown
Also Published As
| Publication number | Publication date |
|---|---|
| FR714908A (fr) | 1931-11-23 |
| GB372066A (en) | 1932-05-05 |