Keywords: DRILLS
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Journal Articles
Journal of the Institution of Civil Engineers (1946) 26 (5): 50–87.
Published: 01 March 1946
... ground. Drilling equipment usually consists of 30-50-lb.jack-hammers, and in this kind of workshotholes finishing l t l Q inch diameter to take 12-inch diameter cartridge of explosives, and from6 feet to 8 feetdeep, will generallybe foundto give the best overall results. As apractical guide...
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