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US Patent: 112,115
Improvement in Drills
Twist Drill Bit
Patentee:
Theodore V. Boyden - 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 pdf tiff
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