Swim fin
United States Patent 3239857
US Patent References:
Swimming and diving device
- - 2851707


Inventors:
Gwynne, Frederick H.
Publication Date:
03/15/1966
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Assignee:
Gwynne, Frederick H.
Primary Class:
441/60
Other Classes:
441/64
International Classes:
A63B31/11; A63B31/00
Foreign References:
DE457103C
GB746764A