Hatchway
United States Patent 2174989
Inventors:
Lyons, George W.
Publication Date:
10/03/1939
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Assignee:
Lyons, George W.
Primary Class:
Other Classes:
52/19, 292/238, 49/398, 16/389, 49/394, 49/33
International Classes:
E06B5/01; E06B5/00