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US Patent: 443,500
Pipe Threading Machine
Patentees: Roderick P. Curtis (exact or similar names) - Southport, Fairfield County, CT Lewis B. Curtis (exact or similar names) - Southport, Fairfield County, CT USPTO Classifications: 408/174, 470/176, 470/75 Tool Categories: metalworking machines : metal threading machines : pipe threading machines Assignees: Curtis & Curtis - Bridgeport, Fairfield County, CT Manufacturer: Curtis & Curtis - Bridgeport, Fairfield County, CT Witnesses: Unknown	Patent Dates: Applied: Mar. 28, 1890 Granted: Dec. 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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