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US Patent: 417,659
Means for Operating the Die Heads of Bolt Threading Machines
Patentee: John Sellers Bancroft (exact or similar names) - Philadelphia, PA USPTO Classifications: 279/71, 408/176, 470/75 Tool Categories: metalworking machines : metal threading machines Assignees: William Sellers & Co. - Philadelphia, PA Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: Oct. 18, 1889 Granted: Dec. 17, 1889 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens "Vintage Machinery" entry for William Sellers & Co.

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