BE407422A - - Google Patents
Info
- Publication number
- BE407422A BE407422A BE407422DA BE407422A BE 407422 A BE407422 A BE 407422A BE 407422D A BE407422D A BE 407422DA BE 407422 A BE407422 A BE 407422A
- Authority
- BE
- Belgium
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/02—Constructional features of telephone sets
- H04M1/19—Arrangements of transmitters, receivers, or complete sets to prevent eavesdropping, to attenuate local noise or to prevent undesired transmission; Mouthpieces or receivers specially adapted therefor
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR782809T | 1934-12-18 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| BE407422A true BE407422A (en:Method) |
Family
ID=9213224
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| BE407422D BE407422A (en:Method) | 1934-12-18 |
Country Status (2)
| Country | Link |
|---|---|
| BE (1) | BE407422A (en:Method) |
| FR (1) | FR782809A (en:Method) |
-
0
- BE BE407422D patent/BE407422A/xx unknown
-
1934
- 1934-12-18 FR FR782809D patent/FR782809A/fr not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| FR782809A (fr) | 1935-06-12 |