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US Patent: 13,998
Extension-Bit
Patentee: John P. Rollins (exact or similar names) - Boston, MA USPTO Classifications: 408/183 Tool Categories: woodworking tools : hand drills : drill bits : adjustable drill bits Assignees: None Manufacturer: Not known to have been produced Witnesses: Lalen Coffin Maynard Twitchle	Patent Dates: Granted: Dec. 25, 1855 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Jeff Joslin (dm)

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