University of Nevada, Las Vegas

Detachable rock drill bit

Full Text

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.



Detachable rock drill bit
DC Type
Is Part Of,4
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TIFF scanned at 400 dpi on Epson Expression 10000X using EPSON Scan Ver. 2.94A.

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