NASA NTRS · 20080004076
Side hole drilling in boreholes
Abstract
Apparatus for use in a borehole or other restricted space to bore a side hole into the strata surrounding the borehole, including a flexible shaft with a drill at its end, and two trains of sheathing members that can be progressively locked together into a rigid structure around the flexible shaft as it is directed sidewardly into the strata.
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Collins, Jr., Earl R.. 1980-10-07. Side hole drilling in boreholes. https://ntrs.nasa.gov/citations/20080004076
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