Title:
Multi-ply fibrous structure
United States Patent 1917456

Inventors:
Mickelson, Alfred O.
Publication Date:
07/11/1933
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Assignee:
ASPHALT PROCESS CORP
Primary Class:
428/136
Other Classes:
428/134, 156/257, 428/138, 156/163, 156/197
International Classes:
D21J1/16; D21J1/00