BE646658A - - Google Patents
Info
- Publication number
- BE646658A BE646658A BE646658DA BE646658A BE 646658 A BE646658 A BE 646658A BE 646658D A BE646658D A BE 646658DA BE 646658 A BE646658 A BE 646658A
- 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)
- Interface Circuits In Exchanges (AREA)
- Monitoring And Testing Of Exchanges (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL297624A NL141746B (en) | 1963-09-09 | 1963-09-09 | MULTIFREQUENT SIGNALING SYSTEM. |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| BE646658A true BE646658A (en) | 1964-10-19 |
Family
ID=19755024
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| BE646658D BE646658A (en) | 1963-09-09 | 1964-04-17 |
Country Status (6)
| Country | Link |
|---|---|
| BE (1) | BE646658A (en) |
| BR (1) | BR6462449D0 (en) |
| CH (1) | CH444242A (en) |
| DE (1) | DE1232212B (en) |
| GB (1) | GB1071526A (en) |
| NL (2) | NL141746B (en) |
-
0
- NL NL297624D patent/NL297624A/xx unknown
-
1963
- 1963-09-09 NL NL297624A patent/NL141746B/en unknown
-
1964
- 1964-04-17 BE BE646658D patent/BE646658A/xx unknown
- 1964-09-01 DE DE1964ST022615 patent/DE1232212B/en active Pending
- 1964-09-04 GB GB3633564A patent/GB1071526A/en not_active Expired
- 1964-09-04 CH CH1155664A patent/CH444242A/en unknown
- 1964-09-08 BR BR16244964A patent/BR6462449D0/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| NL297624A (en) | |
| GB1071526A (en) | 1967-06-07 |
| BR6462449D0 (en) | 1973-09-18 |
| NL141746B (en) | 1974-03-15 |
| CH444242A (en) | 1967-09-30 |
| DE1232212B (en) | 1967-01-12 |