Gas mask communication system
United States Patent 3180333
US Patent References:
Pressure regulator structure for pressure-type gas masks
- - 2684066
Electrical-acoustic transducer
- - 2937244
Microphone support structure
- - 2950360
Gas mask speech transmission
- - 2974665
Pressure regulator structure for pressure-type gas masks
- - 2684066
Electrical-acoustic transducer
- - 2937244
Microphone support structure
- - 2950360
Gas mask speech transmission
- - 2974665
Inventors:
David, Lewis Robert
Publication Date:
04/27/1965
View Patent Images:
Export Citation:
Assignee:
ACME PROT EQUIPMENT CO
Primary Class:
Other Classes:
D24/110.200, 381/376, 2/6.700, 2/6.600, 381/75
International Classes:
A62B18/08; A62B18/00