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US Patent: 970,789
Expansible Bit
Patentee: George P. Butler (exact or similar names) - New Haven, CT USPTO Classifications: 408/194, 408/195, 408/212, 408/213 Tool Categories: woodworking tools : hand drills : drill bits : adjustable drill bits Assignees: None Manufacturer: Not known to have been produced Witnesses: Frederic C. Earle Clara L. Weed	Patent Dates: Applied: Jul. 23, 1909 Granted: Sep. 20, 1910 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Jeff Joslin (dm)

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