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US Patent: 233,488
Art of Manufacturing Mathematical Instruments
Patentee: Samuel Darling (exact or similar names) - Providence, RI USPTO Classifications: 451/449, 82/152, 82/173, 82/900 Tool Categories: Assignees: None Manufacturer: Not known to have been produced Witnesses: John E. Hall Henry Drury Benjamin Gridley George H. Smith	Patent Dates: Applied: Dec. 15, 1879 Granted: Oct. 19, 1880 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens

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