Combined vacuum and pressure relief valve for receiving and storage tanks
United States Patent 1678700

Inventors:
Mcewan, Andrew J.
Publication Date:
07/31/1928
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Assignee:
Mcewan, Andrew J.
Primary Class:
137/488
Other Classes:
251/28, 251/26, 92/97, 137/251.100, 251/31
International Classes:
F16K17/196; G05D16/18; F16K17/18; G05D16/00