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US Patent: 47,812
Improved drill-bit
Patentees:
Robert H. Boyd - Hulton, PA
William W. Grier - Hulton, PA

USPTO Classifications:
175/391, 175/392, 408/211, 408/224

Tool Categories:
woodworking tools : hand drills : drill bits
metalworking machines : drilling and boring : drill bits
woodworking machines : wood drilling and boring : wood drill bits

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
Robert Hague
A. S. Nicholson

Patent Dates:
Granted: May 23, 1865

Patent Pictures:
USPTO pdf tiff
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Description:
The 1868-04-18 issue of Scientific American lists an application for reissue of this patent by Horace F. Love of Windsor, VT. He was the assignee of the original inventors.

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