Stuffing box for polish rods
United States Patent 2002012

Inventors:
Howard, James H.
Publication Date:
05/21/1935
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Assignee:
J H MCEVOY & COMPANY
Primary Class:
277/329
Other Classes:
166/84.100, 184/24, 277/520
International Classes:
E21B33/08; F16J15/18; E21B33/02