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US Patent: 222,736
Machines for Grinding the Sector of Circles
Patentee: George Richards (exact or similar names) - Philadelphia, PA USPTO Classifications: 451/138 Tool Categories: Assignees: Betts Machine Co. - Wilmington, New Castle County, DE Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: Aug. 05, 1879 Granted: Dec. 16, 1879 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens "Vintage Machinery" entry for Betts Machine Co.

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