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US Patent: 628,730
Work Holder for Lathe Spindles
Patentees: Amos Whitney (exact or similar names) - Hartford, Hartford County, CT Frank Harrington (exact or similar names) - Hartford, Hartford County, CT USPTO Classifications: 279/146, 279/50, 279/51, 300/14 Tool Categories: metalworking machines : metal lathes : metal lathe chucks Assignees: Pratt & Whitney Co. - Hartford, Hartford County, CT Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: May 27, 1898 Granted: Jul. 11, 1899 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens "Vintage Machinery" entry for Pratt, Whitney & Co.

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