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US Patent: 21,597
Expansive bit
Patentee: William A. Clark (exact or similar names) - Bethany, CT USPTO Classifications: 408/194, 408/195 Tool Categories: woodworking tools : hand drills : drill bits : adjustable drill bits Assignees: None Manufacturer: W. A. Clark & Co. - Westville, CT Witnesses: Charles H. Shepard James H. Gridley	Patent Dates: Granted: Sep. 28, 1858 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Jeff Joslin
Description: This bit was featured in Scientific American article in their 1861-05-04 issue.

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