Prefabricated conduit
United States Patent 2275572

Inventors:
Somers, William S.
Publication Date:
03/10/1942
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Assignee:
Somers, William S.
Primary Class:
285/125.100
Other Classes:
138/163, 138/DIG.004, 285/424, 285/398, 285/383
International Classes:
F16L23/14; F16L23/00