University of Nevada, Las Vegas

Detachable rock drill bit

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The First Detachable Rock Drill Bit A.L. Hawkesworth, master mechanic at Butte, Montana, patented his drill bit in 1918. It consisted of a double dove tail taper joint in which the bit was the tenon, and the shank the mortise. This was the era of slugger drifters and wiggle tail stopers.

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Detachable rock drill bit
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http://digital.library.unlv.edu/u?/dig,4
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