Segregated pressure fan
United States Patent 2325221

Inventors:
Bretzlaff, Walter H.
Grimes, Charles P.
Publication Date:
07/27/1943
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Assignee:
Bretzlaff, Walter H.
Grimes, Charles P.
Primary Class:
415/143
Other Classes:
416/223B, 415/205, 55/467, 415/169.100
International Classes:
F04D25/16; F04D25/00