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US Patent: 963,986
Combination drill and valve-grinder
Frederick C. Blanchard - Bridgeport, CT

USPTO Classifications:
451/117, 74/318, 74/320, 74/323

Tool Categories:
woodworking tools : hand drills : eggbeater drills
woodworking tools : hand drills : breast drills

Ashcroft Manufacturing Co. - Bridgeport, CT

Ashcroft Manufacturing Co. - Bridgeport, CT

W. R. Clark
James P. O'Neil

Patent Dates:
Applied: Jan. 20, 1910
Granted: Jul. 12, 1910

Patent Pictures: [ 1 | 2 ]
Blanchard 963,986; patent drawing's images rearranged
USPTO pdf tiff
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Blanchard describes his invention as a combination breast drill, reversible ratchet drill and valve grinder. I have one of these combo drills. It is the smoothest operating breast drill I have.

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