Underwater mask with combination speaking diaphragm and demand valve
United States Patent 3348539
US Patent References:
Diving mask
- - 2168695

Shallow water diving faceplate
- - 2304798

Underwater breathing apparatus
- - 2764151

Valve assembly
- - 2922430

Diving mask
- - 2981252


Inventors:
Mcdonald, James H.
Publication Date:
10/24/1967
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Assignee:
Garland, Hudgins
Primary Class:
128/201.190
Other Classes:
128/204.260, 137/908, 128/200.290
International Classes:
B63C11/14; B63C11/26; B63C11/02
Foreign References:
GB808782A