Attic ventilation
United States Patent 2191774

Inventors:
Reed, Lyman C.
Publication Date:
02/27/1940
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Assignee:
Reed, Lyman C.
Primary Class:
454/349
Other Classes:
137/527, 454/353
International Classes:
F24F7/02; F24F11/04; F24F13/14; F24F13/15