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US Patent: 112,115
Improvement in Drills Twist Drill Bit
Patentee: Theodore V. Boyden (exact or similar names) - Bridgeport, CT USPTO Classifications: 408/230 Tool Categories: woodworking tools : hand drills : drill bits : twist drill bits Assignees: None Manufacturer: Not known to have been produced Witnesses: Henry C. Rylands A. J. Hobbs	Patent Dates: Granted: Feb. 28, 1871 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Jeff Joslin (dm)

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