Face mask or shield
United States Patent 2525236
US Patent References:
/0573691.html
- - 0573691

/0680419.html
- - 0680419

Gas mask
- - 1590668

Brick-making machine and method
- - 1783287

Sand blast helmet and ventilating means
- - 1881192


Inventors:
Palmer, Robert R.
Publication Date:
10/10/1950
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Assignee:
Palmer, Robert R.
Primary Class:
128/205.250
International Classes:
A61F9/06; A61F9/04
US Patent References:
2112618Oil burner
2388604Welder's helmet
Foreign References:
GB289808A