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US Patent: 2,147,227
Drill sharpening machine
Patentee: George B. Ambler (exact or similar names) - 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 (New site tip) Google Patents Report data errors or omissions to steward Jeff Joslin Vintage Machinery entry for Black Diamond Saw & Machine Works

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