Expansible cover
United States Patent 2238058

Inventors:
Johnson, Charles R.
Pierce, Robert C.
Publication Date:
04/15/1941
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Assignee:
Pont DU.
NAT STANDARD CO
Primary Class:
87/7
Other Classes:
138/123, 2/240, 102/325, 87/9, 492/48, 299/21
International Classes:
B21F27/00; D04C1/06; E21C37/10; D04C1/00; E21C37/00