Title:
Underwater viewers
United States Patent 3081726
Inventors:
Betts, William M.
Requa, Reginald C.
Publication Date:
03/19/1963
Export Citation:
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Assignee:
Betts, William M.
Requa, Reginald C.
Primary Class:
114/66
Other Classes:
359/895, 441/135
International Classes:
B63C11/48; B63C11/49; B63C11/00
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US Patent References:
2998798Manually propelled watercraft
2717399Under-water viewing device
2712139N/A
2376753Molded boat