Heat insulating panel
United States Patent 2312987

Inventors:
Grassick, Donald D.
Publication Date:
03/02/1943
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Assignee:
ALFOL INSULATION COMPANY INC
Primary Class:
52/789.100
Other Classes:
220/DIG.009, 52/19, 52/793.110, 427/374.100, 156/216, 52/407.300, 220/592.210, 52/794.100
International Classes:
B61D17/08; B61D17/04