Face mask
United States Patent 2507705
US Patent References:
/0804272.html
- - 0804272

/0807666.html
- - 0807666

Compressed-air protective shield
- - 1646103

Workman's protective hood
- - 2259680

Breathing device
- - 2362240


Inventors:
Gaddini, Norman E.
Publication Date:
05/16/1950
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Assignee:
Gaddini, Norman E.
Primary Class:
128/205.250
Other Classes:
128/200.280, 128/204.150
International Classes:
A62B18/04; A62B18/00
US Patent References:
2377122Welding helmet
2402820Welder's mask
2447433Protective hood