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US Patent: 425,839
Twist-drill-grinding machine
Patentee: Oakley S. Walker (exact or similar names) - Worcester, MA USPTO Classifications: 125/11.14, 451/375 Tool Categories: metalworking machines : grinders : drill grinders metalworking machines : grinders : sharpening machines : drill sharpening machines Assignees: Worcester Polytechnic Institute - Worcester, MA Manufacturer: O. S. Walker & Co. - Worcester, MA Witnesses: Frederick E. Knight George A. Ward	Patent Dates: Applied: Oct. 03, 1889 Granted: Apr. 15, 1890 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Jeff Joslin Vintage Machinery entry for O. S. Walker & Co.
Description: This patent date was seen on a "Worcester" twist-drill grinder from O. S. Walker & Co.

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