Title:
Safety helmet
United States Patent 2184043

Inventors:
Heilstedt, Harold R.
Jackson, Stillman D.
Publication Date:
12/19/1939
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Assignee:
Heilstedt, Harold R.
Jackson, Stillman D.
Primary Class:
2/416
Other Classes:
2/202
International Classes:
A42B3/10; A42B3/14; A42B3/04