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US Patent: 73,505
Improvement in stave-machines
Patentee: William S. Colwell (exact or similar names) - Pittsburgh, PA USPTO Classifications: 144/120, 144/132, 144/159, 147/35.5 Tool Categories: trade specific : cooper Assignees: James M. Hemphill - Allegheny City, PA Manufacturer: Mackintosh, Hemphill & Co. - Pittsburgh, PA Witnesses: Unknown	Patent Dates: Granted: Jan. 21, 1868 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Jeff Joslin Vintage Machinery entry for Mackintosh, Hemphill & Co.

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