Drain plug for plastic swimming pools
United States Patent 3320623

Inventors:
Antonio Sr., Joseph J. D.
Publication Date:
05/23/1967
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Assignee:
Antonio Sr., Joseph J. D.
Primary Class:
4/295
International Classes:
E04H4/12; F16L35/00; E04H4/00
US Patent References:
3247999Tank liner construction