Structural assemblies composed of anticreeping interchangeable interlocking structural units
United States Patent 2711231

Inventors:
Spangler, William B.
Publication Date:
06/21/1955
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Assignee:
Spangler, William B.
Primary Class:
404/41
Other Classes:
404/70, 52/712
International Classes:
E01C9/08; E01C9/00
Other References:
None