BE368967A - - Google Patents
Info
- Publication number
- BE368967A BE368967A BE368967DA BE368967A BE 368967 A BE368967 A BE 368967A BE 368967D A BE368967D A BE 368967DA BE 368967 A BE368967 A BE 368967A
- 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)
- Duct Arrangements (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEC43229D DE537196C (de) | 1929-06-13 | 1929-06-13 | Schalldaempfer zum Aufsetzen auf die Einsprache von Mikrotelefonen |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| BE368967A true BE368967A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) |
Family
ID=7025277
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| BE368967D BE368967A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) | 1929-06-13 |
Country Status (3)
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2478783A (en) * | 1946-06-17 | 1949-08-09 | Louis S Scher | Telephone mouthpiece voice silencer with plural silencing chambers |
| US2566975A (en) * | 1947-01-18 | 1951-09-04 | Leo L Beranek | Voice silencer |
| DE888115C (de) * | 1950-05-03 | 1956-10-31 | Helmut Dr-Ing E H Junghans | Vorrichtung an der Einsprache von Fernsprechapparaten zur Verhinderung des Mithoerens |
-
0
- BE BE368967D patent/BE368967A/xx unknown
-
1929
- 1929-05-03 FR FR690595D patent/FR690595A/fr not_active Expired
- 1929-06-13 DE DEC43229D patent/DE537196C/de not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| FR690595A (fr) | 1930-09-23 |
| DE537196C (de) | 1931-10-30 |