CH232789A - Device for signaling current transmission installations. - Google Patents
Device for signaling current transmission installations.Info
- Publication number
- CH232789A CH232789A CH232789DA CH232789A CH 232789 A CH232789 A CH 232789A CH 232789D A CH232789D A CH 232789DA CH 232789 A CH232789 A CH 232789A
- Authority
- CH
- Switzerland
- Prior art keywords
- current transmission
- signaling current
- transmission installations
- installations
- signaling
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/02—Details
- H04B3/20—Reducing echo effects or singing; Opening or closing transmitting path; Conditioning for transmission in one direction or the other
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
- Interconnected Communication Systems, Intercoms, And Interphones (AREA)
- Interface Circuits In Exchanges (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB232789X | 1937-03-25 |
Publications (1)
Publication Number | Publication Date |
---|---|
CH232789A true CH232789A (en) | 1944-06-15 |
Family
ID=10193083
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CH232789D CH232789A (en) | 1937-03-25 | 1938-03-25 | Device for signaling current transmission installations. |
Country Status (3)
Country | Link |
---|---|
CH (1) | CH232789A (en) |
FR (1) | FR835652A (en) |
GB (2) | GB496265A (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2468552A (en) * | 1944-04-28 | 1949-04-26 | Automatic Elect Lab | Voice operated control circuit for two-way signal transmission systems |
-
1937
- 1937-03-25 GB GB27799/38A patent/GB496265A/en not_active Expired
- 1937-03-25 GB GB8890/37A patent/GB494418A/en not_active Expired
-
1938
- 1938-03-23 FR FR835652D patent/FR835652A/en not_active Expired
- 1938-03-25 CH CH232789D patent/CH232789A/en unknown
Also Published As
Publication number | Publication date |
---|---|
FR835652A (en) | 1938-12-28 |
GB494418A (en) | 1938-10-25 |
GB496265A (en) | 1938-11-25 |
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