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US Patent: 428,426
Machine for grinding twist or other drills
Patentees:
Henry Jesse Bamford - London, England
John Henry Storey - London, England

USPTO Classifications:
451/160, 451/375

Tool Categories:
metalworking machines : grinders : sharpening machines

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
Edward C. Hammond
Robert Edward Phillips

Patent Dates:
Applied: Jan. 07, 1889
Granted: May 20, 1890

Patent Pictures:
USPTO pdf tiff
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