BE693127A - - Google Patents
Info
- Publication number
- BE693127A BE693127A BE693127DA BE693127A BE 693127 A BE693127 A BE 693127A BE 693127D A BE693127D A BE 693127DA BE 693127 A BE693127 A BE 693127A
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Use Of Switch Circuits For Exchanges And Methods Of Control Of Multiplex Exchanges (AREA)
- Devices For Supply Of Signal Current (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| BE693127 | 1967-01-25 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| BE693127A true BE693127A (en:Method) | 1967-07-25 |
Family
ID=3850124
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| BE693127D BE693127A (en:Method) | 1967-01-25 | 1967-01-25 |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US3588373A (en:Method) |
| BE (1) | BE693127A (en:Method) |
| DE (1) | DE1562120A1 (en:Method) |
| GB (1) | GB1161271A (en:Method) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL7402574A (nl) * | 1974-02-26 | 1975-08-28 | Philips Nv | Schakeling voor een toondruktoetskeuzetelefoon- toestel. |
-
1967
- 1967-01-25 BE BE693127D patent/BE693127A/xx unknown
-
1968
- 1968-01-18 US US698935A patent/US3588373A/en not_active Expired - Lifetime
- 1968-01-18 GB GB2699/68A patent/GB1161271A/en not_active Expired
- 1968-01-20 DE DE19681562120 patent/DE1562120A1/de active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| DE1562120A1 (de) | 1970-03-05 |
| US3588373A (en) | 1971-06-28 |
| GB1161271A (en) | 1969-08-13 |