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US Patent: 492,451
Grinding apparatus
Patentee: Frank D. Winkley (exact or similar names) - Madison, WI USPTO Classifications: 15/88.4, 451/129, 451/141, 451/294 Tool Categories: Assignees: None Manufacturer: Not known to have been produced Witnesses: N. S. Johnson W. J. Coffin	Patent Dates: Applied: Jan. 18, 1892 Granted: Feb. 28, 1893 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Jeff Joslin
Description: "The object of my invention is to produce a grinding apparatus specially adapted for grinding the cutting knives of lawn mowers..."

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