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HYDRAULICALLY OPERATED EARTH BORING TOOLS
United States Patent 3438450
US Patent References:
Drilling apparatus
- - 2781185
Drill carriages
- - 3181623
Inventors:
Failing, Jay C.
Publication Date:
04/15/1969
View Patent Images:
Download PDF 3438450
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Assignee:
FAILING IND INC
Primary Class:
173/44
Other Classes:
173/28
International Classes:
E21B7/02
;
E21B15/04
;
E21B15/00
; E21C5/10; E21C9/00; E21C11/02
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