FR690595A - Mute for telephone handsets - Google Patents
Mute for telephone handsetsInfo
- Publication number
- FR690595A FR690595A FR690595DA FR690595A FR 690595 A FR690595 A FR 690595A FR 690595D A FR690595D A FR 690595DA FR 690595 A FR690595 A FR 690595A
- Authority
- FR
- France
- Prior art keywords
- mute
- telephone handsets
- handsets
- telephone
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
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 (en) | 1929-06-13 | 1929-06-13 | Sound absorber to be placed on the voice of microphones |
Publications (1)
Publication Number | Publication Date |
---|---|
FR690595A true FR690595A (en) | 1930-09-23 |
Family
ID=7025277
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR690595D Expired FR690595A (en) | 1929-06-13 | 1929-05-03 | Mute for telephone handsets |
Country Status (3)
Country | Link |
---|---|
BE (1) | BE368967A (en) |
DE (1) | DE537196C (en) |
FR (1) | FR690595A (en) |
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 (en) * | 1950-05-03 | 1956-10-31 | Helmut Dr-Ing E H Junghans | Device for the voice-over of telephone sets to prevent eavesdropping |
-
0
- BE BE368967D patent/BE368967A/xx unknown
-
1929
- 1929-05-03 FR FR690595D patent/FR690595A/en not_active Expired
- 1929-06-13 DE DEC43229D patent/DE537196C/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
BE368967A (en) | |
DE537196C (en) | 1931-10-30 |
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