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
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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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