BE512709A - - Google Patents
Info
- Publication number
- BE512709A BE512709A BE512709DA BE512709A BE 512709 A BE512709 A BE 512709A BE 512709D A BE512709D A BE 512709DA BE 512709 A BE512709 A BE 512709A
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Noise Elimination (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IT319073X | 1951-07-10 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| BE512709A true BE512709A (en:Method) |
Family
ID=11234479
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| BE512709D BE512709A (en:Method) | 1951-07-10 |
Country Status (3)
| Country | Link |
|---|---|
| BE (1) | BE512709A (en:Method) |
| CH (1) | CH319073A (en:Method) |
| GB (1) | GB710600A (en:Method) |
-
0
- BE BE512709D patent/BE512709A/xx unknown
-
1952
- 1952-06-06 GB GB14314/52A patent/GB710600A/en not_active Expired
- 1952-07-08 CH CH319073D patent/CH319073A/fr unknown
Also Published As
| Publication number | Publication date |
|---|---|
| CH319073A (fr) | 1957-01-31 |
| GB710600A (en) | 1954-06-16 |