BE446491A - - Google Patents
Info
- Publication number
- BE446491A BE446491A BE446491DA BE446491A BE 446491 A BE446491 A BE 446491A BE 446491D A BE446491D A BE 446491DA BE 446491 A BE446491 A BE 446491A
- 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
- H04Q1/442—Signalling arrangements; Manipulation of signalling currents using alternate current with out-of-voice band signalling frequencies
- H04Q1/4426—Signalling arrangements; Manipulation of signalling currents using alternate current with out-of-voice band signalling frequencies using two or more signalling frequencies, transmitted in succession or simultaneously
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Electrotherapy Devices (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL2474234X | 1941-06-21 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| BE446491A true BE446491A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) |
Family
ID=19874318
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| BE446491D BE446491A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) | 1941-06-21 |
Country Status (3)
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2045735A (en) * | 1934-05-26 | 1936-06-30 | American Telephone & Telegraph | Radio receiving circuits |
-
0
- BE BE446491D patent/BE446491A/xx unknown
-
1942
- 1942-05-29 FR FR882438D patent/FR882438A/fr not_active Expired
-
1943
- 1943-04-01 US US481511A patent/US2474234A/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| US2474234A (en) | 1949-06-28 |
| FR882438A (fr) | 1943-06-02 |