BE436739A - - Google Patents
Info
- Publication number
- BE436739A BE436739A BE436739DA BE436739A BE 436739 A BE436739 A BE 436739A BE 436739D A BE436739D A BE 436739DA BE 436739 A BE436739 A BE 436739A
- 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
- H04Q1/446—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using one signalling frequency
- H04Q1/4465—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using one signalling frequency the same frequency being used for all signalling information, e.g. A.C. nr.9 system
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE1938L0096432 DE703506C (en) | 1938-12-01 | 1938-12-01 | Circuit for selective tone frequency call |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| BE436739A true BE436739A (en) |
Family
ID=27797496
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| BE436739D BE436739A (en) | 1938-12-01 |
Country Status (4)
| Country | Link |
|---|---|
| BE (1) | BE436739A (en) |
| DE (1) | DE703506C (en) |
| FR (1) | FR868421A (en) |
| NL (1) | NL60537C (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE954519C (en) * | 1951-12-13 | 1956-12-20 | Standard Elek K Ag | Circuit arrangement for receiving call and dialing signals |
| DE1161593C2 (en) * | 1961-06-02 | 1974-06-20 | Felten & Guilleaume Gmbh | Circuit arrangement for call converter with transition from two-wire to four-wire low-frequency connection |
| CH665738A5 (en) * | 1984-09-11 | 1988-05-31 | Siemens Ag Albis | FORK GEAR. |
-
0
- BE BE436739D patent/BE436739A/xx unknown
- NL NL60537D patent/NL60537C/xx active
-
1938
- 1938-12-01 DE DE1938L0096432 patent/DE703506C/en not_active Expired
-
1940
- 1940-12-27 FR FR868421D patent/FR868421A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| FR868421A (en) | 1941-12-30 |
| NL60537C (en) | |
| DE703506C (en) | 1941-03-11 |