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a. The long, tapered, half-round slot in the deflection wedge that acts as
a guide in directing the bit to follow a new course in deflecting a
borehole. Any of the spiral depressions on a cylindrical object, such as
the spiral depression on the surface of fluted core or the rifling in a
gun barrel. Long
b. Derb. The place where a miner is working. See also: grove Fay
c. A mine, from the German, grube. Fay
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