Circulation control means
United States Patent 2153604

Inventors:
Stewart, Wheller Harry
Publication Date:
04/11/1939
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Assignee:
Stewart, Wheller Harry
Primary Class:
415/146
Other Classes:
165/96, 123/142.50R, 165/122, 123/41.650, 416/146R, 415/148
International Classes:
F04D25/14; F04D25/02