FR959681A - - Google Patents
Info
- Publication number
- FR959681A FR959681A FR959681DA FR959681A FR 959681 A FR959681 A FR 959681A FR 959681D A FR959681D A FR 959681DA FR 959681 A FR959681 A FR 959681A
- Authority
- FR
- France
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
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
- H04Q1/442—Signalling arrangements; Manipulation of signalling currents using alternate current with out-of-voice band signalling frequencies
- H04Q1/4423—Signalling arrangements; Manipulation of signalling currents using alternate current with out-of-voice band signalling frequencies using one signalling frequency
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Interface Circuits In Exchanges (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR2424594X | 1941-03-29 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| FR959681A true FR959681A (xx) | 1950-03-31 |
Family
ID=9685328
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| FR959681D Expired FR959681A (xx) | 1941-03-29 |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US2424594A (xx) |
| FR (1) | FR959681A (xx) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BE506490A (xx) * | 1951-01-16 |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1709554A (en) * | 1927-07-20 | 1929-04-16 | Bell Telephone Labor Inc | Voice-frequency calling system |
| US2004759A (en) * | 1934-07-12 | 1935-06-11 | Alfred T Jester | Ringing repeater |
| US2036079A (en) * | 1935-05-01 | 1936-03-31 | Bell Telephone Labor Inc | Circuit for voice frequency ringing and for voice frequency current |
-
0
- FR FR959681D patent/FR959681A/fr not_active Expired
-
1943
- 1943-04-01 US US481508A patent/US2424594A/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| US2424594A (en) | 1947-07-29 |