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US Patent: 158,172
Improvement in machine for grinding knives
Patentees: Amos W. Proctor (exact or similar names) - Billerica, MA Charles H. Hill (exact or similar names) - Billerica, MA USPTO Classifications: 451/340, 451/369 Tool Categories: woodworking machines : machine and tool cutters : cutter grinding Assignees: Union Stone Co. - Boston, MA Manufacturer: Cutter & Wood - Boston, MA Union Stone Co. - Boston, MA Witnesses: C. H. Stinchfield H. M. Proctor	Patent Dates: Applied: Aug. 28, 1874 Granted: Dec. 29, 1874 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Jeff Joslin Vintage Machinery entry for Cutter & Wood Vintage Machinery entry for Union Stone Co.

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