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May 27, 2012
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Dictionary


rock' bolt"



Mining, Civ. Engin.
a steel or fiberglass bolt inserted and anchored in a hole drilled in rock to prevent caving of the roof of a tunnel or subterranean chamber.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

rock blennyrock bottom
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