BE467075A - - Google Patents
Info
- Publication number
- BE467075A BE467075A BE467075DA BE467075A BE 467075 A BE467075 A BE 467075A BE 467075D A BE467075D A BE 467075DA BE 467075 A BE467075 A BE 467075A
- 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
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3338/44A GB572002A (en) | 1944-02-23 | 1944-02-23 | Improvements in telephone or like signalling systems |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| BE467075A true BE467075A (en) |
Family
ID=9756430
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| BE467075D BE467075A (en) | 1944-02-23 |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US2424452A (en) |
| BE (1) | BE467075A (en) |
| GB (1) | GB572002A (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB641888A (en) * | 1947-02-07 | 1950-08-23 | Standard Telephones Cables Ltd | Improvements in or relating to electric signalling systems |
| GB654639A (en) * | 1947-02-07 | 1951-06-27 | Standard Telephones Cables Ltd | Improvements in or relating to electric signalling systems |
| US2566009A (en) * | 1947-12-12 | 1951-08-28 | Automatic Elect Lab | Interexchange switching telephone system |
| DE1021016B (en) * | 1955-04-29 | 1957-12-19 | Standard Elektrik Ag | Circuit arrangement for telecommunication and telecontrol systems for signal transmission according to a frequency code system |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1881273A (en) * | 1931-01-07 | 1932-10-04 | Western Electric Co | Telephone system |
| FR744153A (en) * | 1931-11-07 | 1933-04-13 | ||
| US2310749A (en) * | 1942-03-31 | 1943-02-09 | Bell Telephone Labor Inc | Singaling system |
| GB559016A (en) * | 1942-07-28 | 1944-02-01 | Automatic Telephone & Elect | Improvements in or relating to telephone or like systems |
-
0
- BE BE467075D patent/BE467075A/xx unknown
-
1944
- 1944-02-23 GB GB3338/44A patent/GB572002A/en not_active Expired
- 1944-12-08 US US567230A patent/US2424452A/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| US2424452A (en) | 1947-07-22 |
| GB572002A (en) | 1945-09-18 |