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churn drill

a portable drill rig using a bit fashioned on a massive steel cylinder that is alternately lifted and dropped to drill a hole in earth and rock. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2016.
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  • This is a mechanical method and one form of apparatus employed is of the churn-drill type common throughout oil and coal regions.

    The Business of Mining Arthur J. Hoskin

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