Backwater control device for sewers
United States Patent 2844163
US Patent References:
/1488604.html
- - 1488604

Regulating valve
- - 2310677

Automatic sewer flood control
- - 2431640

Backwater valve
- - 2695072

Backwater sewer trap
- - 2739662


Inventors:
Otto, Steinberg
Publication Date:
07/22/1958
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Assignee:
Otto, Steinberg
Primary Class:
137/423
Other Classes:
137/115.020
International Classes:
E03F5/10; E03F7/04; F16K31/24; E03F7/00; F16K31/18
Foreign References:
DE248033C