BE467333A - - Google Patents
Info
- Publication number
- BE467333A BE467333A BE467333DA BE467333A BE 467333 A BE467333 A BE 467333A BE 467333D A BE467333D A BE 467333DA BE 467333 A BE467333 A BE 467333A
- 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
- H04Q1/453—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling in which m-out-of-n signalling frequencies are transmitted
- H04Q1/4535—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling in which m-out-of-n signalling frequencies are transmitted with an additional signal transmitted for voice protection
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Interface Circuits In Exchanges (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2376352X | 1942-07-28 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| BE467333A true BE467333A (fr) |
Family
ID=10905151
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| BE467333D BE467333A (fr) | 1942-07-28 |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US2376352A (fr) |
| BE (1) | BE467333A (fr) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB641888A (en) * | 1947-02-07 | 1950-08-23 | Standard Telephones Cables Ltd | Improvements in or relating to electric signalling systems |
| US2607854A (en) * | 1947-07-22 | 1952-08-19 | Automatic Elect Lab | Automatic toll telephone system |
| US2566009A (en) * | 1947-12-12 | 1951-08-28 | Automatic Elect Lab | Interexchange switching telephone system |
-
0
- BE BE467333D patent/BE467333A/xx unknown
-
1943
- 1943-05-31 US US489136A patent/US2376352A/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| US2376352A (en) | 1945-05-22 |