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US Patent: 2,147,227
Drill sharpening machine
Patentee:
George B. Ambler - Natick, MA

USPTO Classifications:
279/44, 279/53, 279/58, 451/274, 451/375

Tool Categories:
metalworking machines : grinders : sharpening machines : drill sharpening machines
metalworking machines : grinders : drill grinders

Assignees:
Black Diamond Saw & machine Works - Natick, MA

Manufacturer:
Black Diamond Saw & machine Works - Natick, MA

Witnesses:
Unknown

Patent Dates:
Applied: Jan. 14, 1935
Granted: Feb. 14, 1939

Patent Pictures:
USPTO pdf tiff
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"Vintage Machinery" entry for Black Diamond Saw & Machine Works

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