Backwater valve
United States Patent 2695072
US Patent References:
/1205199.html
- - 1205199

Sewer check
- - 1732319

Tube testing device
- - 2203688

Flood control system
- - 2421066


Inventors:
Adam, Hauslein
Publication Date:
11/23/1954
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Assignee:
Adam, Hauslein
Primary Class:
137/445
Other Classes:
137/448, 137/565.350
International Classes:
E03F7/04; E03F7/00
Foreign References:
GB191021646A
FR682295A