System of draining
United States Patent 1734777

Inventors:
Pike, Frank A.
Publication Date:
11/05/1929
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Assignee:
Pike, Frank A.
Primary Class:
52/169.500
Other Classes:
52/302.300, 52/198, 210/532.100, 52/169.140
International Classes:
E02D31/02; E02D31/00