Automatic window-ventilator
United States Patent 1335929

Inventors:
Allen, Victor M.
Publication Date:
04/06/1920
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Assignee:
Allen, Victor M.
Primary Class:
49/2
Other Classes:
160/3, 236/49.500, 49/21, 454/221, 160/91, 160/6
International Classes:
E06B7/084; E06B7/02