BE437367A - - Google Patents
Info
- Publication number
- BE437367A BE437367A BE437367DA BE437367A BE 437367 A BE437367 A BE 437367A BE 437367D A BE437367D A BE 437367DA BE 437367 A BE437367 A BE 437367A
- Authority
- BE
- Belgium
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M3/00—Automatic or semi-automatic exchanges
- H04M3/40—Applications of speech amplifiers
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB233307X | 1938-12-14 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| BE437367A true BE437367A (en:Method) |
Family
ID=10193869
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| BE437367D BE437367A (en:Method) | 1938-12-14 |
Country Status (4)
| Country | Link |
|---|---|
| BE (1) | BE437367A (en:Method) |
| CH (1) | CH233307A (en:Method) |
| FR (1) | FR862315A (en:Method) |
| NL (1) | NL61476C (en:Method) |
-
0
- NL NL61476D patent/NL61476C/xx active
- BE BE437367D patent/BE437367A/xx unknown
-
1939
- 1939-12-12 FR FR862315D patent/FR862315A/fr not_active Expired
-
1940
- 1940-02-07 CH CH233307D patent/CH233307A/fr unknown
Also Published As
| Publication number | Publication date |
|---|---|
| NL61476C (en:Method) | |
| FR862315A (fr) | 1941-03-04 |
| CH233307A (fr) | 1944-07-15 |