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US Patent: 1,379,332
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Patentee: George P. Butler (exact or similar names) - New Haven, CT USPTO Classifications: 408/186, 408/194, 408/195, 408/212 Tool Categories: woodworking tools : hand drills : drill bits : adjustable drill bits Assignees: Winchester Repeating Arms Co. - New Haven, CT Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: Apr. 12, 1920 Granted: May 24, 1921 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Jeff Joslin

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