Composite construction material
United States Patent 2064327

Inventors:
Upson, Charles A.
Publication Date:
12/15/1936
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Assignee:
UPSON CO
Primary Class:
442/120
Other Classes:
296/39.300, 442/136, 428/453, 428/920, 428/537.500, 428/464, 442/137
International Classes:
D21J1/16; D21J1/00