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US Patent: 411,953
Adjustable bit
Patentee: James M. Cunningham (exact or similar names) - Lewisburg, WV USPTO Classifications: 144/241 Tool Categories: woodworking tools : hand drills : drill bits : adjustable drill bits Assignees: James M. Cunningham - Lewisburg, WV John F. Estill - Lewisburg, WV Manufacturer: Not known to have been produced Witnesses: F. M. Punick L. J. Williams	Patent Dates: Applied: Sep. 26, 1888 Granted: Oct. 01, 1889 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Jeff Joslin
Description: "The invention relates to improvements in adjustable bits to be used with mortising-machines and adapted to cut tenons of different sizes..."

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