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US Patent: 437,291
Machine for Simultaneously Threading a Plurality of Bolts
Patentee: Roderick P. Curtis (exact or similar names) - Southport, Fairfield County, CT USPTO Classifications: 408/43 Tool Categories: metalworking machines : metal threading machines Assignees: Curtis & Curtis - Bridgeport, Fairfield County, CT Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: Dec. 12, 1889 Granted: Sep. 30, 1890 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens "Vintage Machinery" entry for Curtis & Curtis Co.

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