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US Patent: 578,802
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Patentee: George E. Witherell (exact or similar names) - Hartford, Hartford County, CT USPTO Classifications: 408/154, 408/158, 470/190 Tool Categories: metalworking tools : tap and die holders Assignees: Hartford Machine Screw Co. - Hartford, Hartford County, CT Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: Mar. 04, 1896 Granted: Mar. 16, 1897 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens "Vintage Machinery" entry for Hartford Machine Screw Co.

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