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Title:
Fluid-operated swab
United States Patent 1769637
Inventors:
Fletcher, Harold W.
Ricker, Norman H.
Application Number:
US31374228A
Publication Date:
07/01/1930
Filing Date:
10/20/1928
Assignee:
HUGHES TOOL CO
Primary Class:
International Classes:
E21B23/10; E21B37/10
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