LU30955A1 - - Google Patents
Info
- Publication number
- LU30955A1 LU30955A1 LU30955DA LU30955A1 LU 30955 A1 LU30955 A1 LU 30955A1 LU 30955D A LU30955D A LU 30955DA LU 30955 A1 LU30955 A1 LU 30955A1
- Authority
- LU
- Luxembourg
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M9/00—Arrangements for interconnection not involving centralised switching
- H04M9/08—Two-way loud-speaking telephone systems with means for conditioning the signal, e.g. for suppressing echoes for one or both directions of traffic
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Interface Circuits In Exchanges (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR1024329T | 1950-09-06 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| LU30955A1 true LU30955A1 (en) |
Family
ID=9578766
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| LU30955D LU30955A1 (en) | 1950-09-06 |
Country Status (5)
| Country | Link |
|---|---|
| BE (1) | BE505491A (en) |
| CH (1) | CH305270A (en) |
| FR (2) | FR1024329A (en) |
| GB (1) | GB690720A (en) |
| LU (1) | LU30955A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1129543B (en) * | 1958-06-25 | 1962-05-17 | Gylling & Co Ab | Circuit arrangement for voice-controlled intercom systems |
-
0
- LU LU30955D patent/LU30955A1/xx unknown
- BE BE505491D patent/BE505491A/xx unknown
-
1950
- 1950-09-06 FR FR1024329D patent/FR1024329A/en not_active Expired
-
1951
- 1951-08-17 FR FR61954D patent/FR61954E/en not_active Expired
- 1951-08-28 CH CH305270D patent/CH305270A/en unknown
- 1951-09-06 GB GB21086/51A patent/GB690720A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| FR1024329A (en) | 1953-03-31 |
| CH305270A (en) | 1955-02-15 |
| GB690720A (en) | 1953-04-29 |
| FR61954E (en) | 1955-06-01 |
| BE505491A (en) |