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US Patent: 728,572
Fluid Pressure Operated Chuck
Patentee: Bengt M. W. Hanson (exact or similar names) - Hartford, Hartford County, CT USPTO Classifications: 279/146, 279/4.08, 279/51, 451/398, 92/108 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: Jan. 20, 1902 Granted: May 19, 1903 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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