Title:
Adjustable venting control for air valves
United States Patent 2167321

Inventors:
Abercrombie, Charles W.
Publication Date:
07/25/1939
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Assignee:
BRIDGEPORT BRASS CO
Primary Class:
137/556
Other Classes:
116/277, 251/351
International Classes:
F24D19/08; F24D19/00