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Title: Bit makers fight to survive

Journal Article · · Coal Age; (United States)
OSTI ID:6711313

Competition is fierce amongst the manufacturers of roof drill bits, and testing and machining techniques have improved to design bits that last longer. Information is given in tabulated form on various models and their USA manufacturers. Diamond bits for roof drilling are discussed.

OSTI ID:
6711313
Journal Information:
Coal Age; (United States), Vol. 88:4
Country of Publication:
United States
Language:
English