Soundproof shield
United States Patent 2684067
US Patent References:
Ear mask
- - 1873864
Silencer
- - 2037884
Mounting means for electrically operated units
- - 2313379
Telephone mouthpiece voice silencer with plural silencing chambers
- - 2478783
Microphone sound filter
- - 2536261
Ear mask
- - 1873864
Silencer
- - 2037884
Mounting means for electrically operated units
- - 2313379
Telephone mouthpiece voice silencer with plural silencing chambers
- - 2478783
Microphone sound filter
- - 2536261
Inventors:
Lienard, Pierre A.
Publication Date:
07/20/1954
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Export Citation:
Assignee:
ONERA (OFF NAT AEROSPATIALE)
Primary Class:
International Classes:
A42B3/16; A42B3/04
US Patent References:
| 2566975 | Voice silencer |
Foreign References:
| FR977197A | ||||
| FR1014280A |