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US Patent: 473,639
Sleeve for taper drills
Patentee: Charles T. Pratt (exact or similar names) - Clayville, NY USPTO Classifications: 279/54, 279/68 Tool Categories: metalworking machines : drilling and boring : drill presses : drill press chucks woodworking machines : wood drilling and boring : drill presses : drill press chucks Assignees: Pratt Chuck Co. - Frankfort, NY Manufacturer: Pratt Chuck Co. - Frankfort, NY Witnesses: C. Humphrey C. M. Butler	Patent Dates: Applied: Aug. 13, 1891 Granted: Apr. 26, 1892 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Jeff Joslin Vintage Machinery entry for Pratt Chuck Co.

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