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US Patent: 313,735
Expansible bit
Patentee: George H. Hill (exact or similar names) - Derby, CT USPTO Classifications: 408/194, 408/195, 408/212, 408/213 Tool Categories: woodworking tools : hand drills : drill bits : adjustable drill bits Assignees: George H. Hill - Derby, CT William J. Welsh - Birmingham, CT Manufacturer: Excelsior Mfg. Co. - Unknown, Unknown Witnesses: A. F. Sherwood William J. Clark	Patent Dates: Applied: Jan. 23, 1885 Granted: Mar. 10, 1885 Patent Pictures: [ 1 | 2 ] USPTO (New site tip) Google Patents Report data errors or omissions to steward Jeff Joslin

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