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US Patent: 237,784
Machine for Grinding Plug Valves
Patentee: Edgar V. Tanner (exact or similar names) - Springfield, Hampden County, MA USPTO Classifications: 451/116 Tool Categories: specialty tools : valve grinding tools Assignees: Edgar V. Tanner - Springfield, Hampden County, MA Henry M. Brewster - Springfield, Hampden County, MA Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: Dec. 08, 1880 Granted: Feb. 15, 1881 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens

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