Annular support for rigid protective hats
United States Patent 2665422
US Patent References:
Safety hat or cap
- - 2074627

Safety hat
- - 2177145


Inventors:
Green, Daniel A.
Deike Jr., George H.
Publication Date:
01/12/1954
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Assignee:
MINE SAFETY APPLIANCES CO
Primary Class:
2/416
International Classes:
A42B3/14; A42B3/04
Foreign References:
DE630473C