Breathing apparatus for swimmers
United States Patent 2317236

Inventors:
Wilen, Charles H.
Alexandre, Kramarenko
Publication Date:
04/20/1943
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Assignee:
Wilen, Charles H.
Alexandre, Kramarenko
Primary Class:
128/201.110
Other Classes:
128/201.180
International Classes:
B63C11/20; B63C11/02