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US Patent: 449,246
Boring-tool holder
Patentee: Simon Peter Graham (exact or similar names) - Brantford, ON Canada USPTO Classifications: 279/156, 279/42 Tool Categories: metalworking machines : drilling and boring : drill presses : drill press chucks woodworking machines : wood drilling and boring : drill presses : drill press chucks Assignees: None Manufacturer: Graham Twist Drill Co. - Detroit, MI Detroit Twist Drill Co. - Detroit, MI Witnesses: P. J. Edmunds A. Edmunds	Patent Dates: Applied: Sep. 13, 1888 Granted: Mar. 31, 1891 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Jeff Joslin
Description: Improvement to the boring tool holder of patent 339,544; that earlier patent also defined the special drill bit that fit this chuck.

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