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US Patent: 508,268
Machine for Sharpening Drills
Patentee: John Sellers Bancroft (exact or similar names) - Philadelphia, PA USPTO Classifications: 451/138, 451/375 Tool Categories: metalworking machines : grinders : drill grinders Assignees: William Sellers & Co. - Philadelphia, PA Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: Jul. 21, 1893 Granted: Nov. 07, 1893 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens "Vintage Machinery" entry for William Sellers & Co.

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