Air treatment device
United States Patent 2173073

Inventors:
Pierson, Carl W.
Publication Date:
09/12/1939
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Assignee:
Pierson, Carl W.
Primary Class:
261/30
Other Classes:
261/107, 454/269, 454/234, 422/120, 261/DIG.042, 126/110B, 96/223, 422/305, 422/4
International Classes:
F24F3/12