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US Patent: 158,172
Improvement in machine for grinding knives
Patentees:
Amos W. Proctor - Billerica, MA
Charles H. Hill - 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:
Union Stone Co. - Boston, MA
Cutter & Wood - Boston, MA

Witnesses:
C. H. Stinchfield
H. M. Proctor

Patent Dates:
Applied: Aug. 28, 1874
Granted: Dec. 29, 1874

Patent Pictures:
USPTO pdf tiff
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"Vintage Machinery" entry for Union Stone Co.
"Vintage Machinery" entry for Cutter & Wood

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