relief hole
McGraw-Hill Science & Technology Dictionary:
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relief hole
(ri′lēf ′hōl)
(engineering) Any of the holes fired after the cut holes and before the lifter holes in breaking ground for tunneling or shaft sinking.
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McGraw-Hill Science & Technology Dictionary
McGraw-Hill Dictionary of Scientific and Technical Terms. Copyright © 2003, 1994, 1989, 1984, 1978, 1976, 1974 by McGraw-Hill Companies, Inc. All rights reserved.
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