Title:
Helmet for divers, miners, firemen, and the like
United States Patent 1930399

Inventors:
Hermann, Stelzner
Publication Date:
10/10/1933
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Assignee:
Drager, Otto H.
Primary Class:
128/201.230
Other Classes:
128/202.140
International Classes:
A62B17/04; A62B17/00