Progress report 4 on investigation of detachable rock-drill bits / by McHenry Mosier.
|Main Author:||Mosier, McHenry.|
[Washington, D.C.] : U.S. Dept. of the Interior, Bureau of Mines, 1937.
Drilling and boring.
Bits (Drilling and boring)
"Printed by the Timken Roller Bearing Company, Canton, Ohio, U.S.A., under a cooperative agreement with the United States Bureau of Mines" -t.p.
37 p. :
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