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US Patent: RE3,516
Improvement in expansive bits
Patentee: William A. Clark (exact or similar names) - Bethany, CT USPTO Classifications: 408/194, 408/195, 408/213 Tool Categories: woodworking tools : hand drills : drill bits : adjustable drill bits Assignees: None Manufacturer: William A. Clark - Bethany, CT Witnesses: J. H. Shumway A. Tibbits	Patent Dates: Granted: Jun. 22, 1869 Reissue Information: Reissue of 20,192 (May 11, 1858) Reissued as RE3,733 (Nov. 16, 1869) Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Jeff Joslin

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