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US Patent: 81,611
Grindstone Frame
Patentee: Joseph W. Douglas (exact or similar names) - Middletown, Middlesex County, CT USPTO Classifications: 451/342, 451/406 Tool Categories: metalworking machines : grinders Assignees: W. Douglas - Middletown, Middlesex County, CT B. Douglas - Middletown, Middlesex County, CT Manufacturer: W. & B. Douglas - Middletown, CT Witnesses: John M. Douglas George M. Smith J. A. Frazier J. A. Service	Patent Dates: Granted: Sep. 01, 1868 Patent Pictures: [ 1 | 2 ] USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens "Vintage Machinery" entry for W. & B. Douglas

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