Title:
Fan structure
United States Patent 2237039

Inventors:
Eugene, Newnham
Publication Date:
04/01/1941
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Assignee:
KNAPP MONARCH CO
Primary Class:
416/214R
Other Classes:
416/220A, 416/240, 416/241R, 416/241A, 416/220R, 416/245R
International Classes:
F04D29/38