A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Progress report on investigation of detachable rock-drill bits
Data on use of detachable bits in 10 metal mines; comparative costs for drilling with conventional and detachable bits; reconditioning of drill steel; various data on rock drilling at these mines. (See also - n 6877 Feb 1936 9 p; Engineering v 142 n 3693 Oct 23 1936 p 440)
Progress report on investigation of detachable rock-drill bits
Data on use of detachable bits in 10 metal mines; comparative costs for drilling with conventional and detachable bits; reconditioning of drill steel; various data on rock drilling at these mines. (See also - n 6877 Feb 1936 9 p; Engineering v 142 n 3693 Oct 23 1936 p 440)
Progress report on investigation of detachable rock-drill bits
U S Bur Mines -- Information Cir
Mosier, M. (author)
1936
20 pages
Report
English
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