Automatic vent
United States Patent 2461392
US Patent References:
Multiple check valve
- - 1978507


Inventors:
Parry, Edward C.
Publication Date:
02/08/1949
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Assignee:
Parry, Edward C.
Primary Class:
137/527.800
Other Classes:
4/211, 220/3.200
International Classes:
E03F5/08; E03F5/00
Foreign References:
GB191023257A