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US Patent: 158,173
Improvement in belt-shifters
Patentees:
Amos W. Proctor - Billerica, MA
Charles H. Hill - Billerica, MA

USPTO Classifications:
474/122

Tool Categories:
woodworking machines : machine and tool cutters : cutter grinding
industrial machines : industrial machine mechanisms : industrial machine pulleys and belt drive mechanisms

Assignees:
Union Stone Co. - Boston, MA

Manufacturer:
Union Stone Co. - Boston, MA

Witnesses:
C. H. Stinchfield
Charles F. Arbott

Patent Dates:
Applied: Nov. 13, 1874
Granted: Dec. 29, 1874

Patent Pictures:
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"Vintage Machinery" entry for Union Stone Co.

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