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US Patent: 441,570
Lens Grinding Machine
Patentee: Richard B. H. Leighton (exact or similar names) - Philadelphia, PA USPTO Classifications: 142/1, 451/123, 451/227, 451/277, 451/294, 451/42 Tool Categories: specialty machines : material grinding machines Assignees: None Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: Mar. 06, 1890 Granted: Nov. 25, 1890 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens

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