Twin window fan
United States Patent 2805820

Inventors:
Evarts, Ralph E.
Publication Date:
09/10/1957
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Assignee:
O A SUTTON CORP INC
Primary Class:
417/238
Other Classes:
454/200, 211/1.300, 417/338, 248/223.410, D23/371, 417/234, 417/360, 403/62
International Classes:
F04D29/64; F04D29/60
US Patent References:
2620127Air translating apparatus
2644390Reversible-flow window fan
2650535Ventilating and air circulating device