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Title:
Hydraulic support prop
United States Patent 3281107
Inventors:
Lewis, Warren J.
Publication Date:
10/25/1966
View Patent Images:
Download PDF 3281107
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Assignee:
OHIO BRASS CO
Primary Class:
254/93R
International Classes:
E21D15/45
;
E21D15/00
Foreign References:
FR1249070A