Method of laying and protecting underground pipe lines
United States Patent 1792855

Inventors:
Forbes, Mcrae Donald
Publication Date:
02/17/1931
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Assignee:
Forbes, Mcrae Donald
Primary Class:
405/155
Other Classes:
138/105, 405/157, 118/DIG.011, 138/146
International Classes:
F16L58/12; F16L58/02