Composite window sash and screen
United States Patent 1980990

Inventors:
Gronbech, Hans P.
Publication Date:
11/20/1934
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Assignee:
Gronbech, Hans P.
Primary Class:
160/23.100
Other Classes:
160/99, 49/425, 49/450
International Classes:
E06B9/54; E06B9/52