Conduit driving mechanism
United States Patent 1894446
Inventors:
Mckenny, Van S.
Publication Date:
01/17/1933
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Assignee:
NE PAGE MCKENNY COMPANY
Primary Class:
Other Classes:
405/184, 173/147, 175/62, 173/34, 173/132, 175/22
International Classes:
E21B19/084; E21B19/00