Backflow check float for sewers
United States Patent 2638178
US Patent References:
/0714006.html
- - 0714006

/1196405.html
- - 1196405

Backwater valve
- - 1606396

Drain trap valve
- - 2049909


Inventors:
Mcrill, Oris W.
Publication Date:
05/12/1953
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Assignee:
Harry, Riechman C.
Primary Class:
137/409
International Classes:
E03F5/042; F16K31/22; E03F5/04; F16K31/18