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US Patent: 439,122
Pipe and Bolt Threading Attachment for Lathes
Patentee: Lewis B. Curtis (exact or similar names) - Southport, Fairfield County, CT USPTO Classifications: 29/DIG.67, 408/56, 470/58 Tool Categories: metalworking machines : metal lathes : metal lathe accessories and attachments metalworking machines : metal threading machines Assignees: Curtis & Curtis - Bridgeport, Fairfield County, CT Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: Feb. 04, 1890 Granted: Oct. 28, 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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