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US Patent: 118,178
Improvement in Twist-Drills
Patentee:
Benjamin Arnold - East Greenwich, RI

USPTO Classifications:
408/226, 408/230

Tool Categories:
woodworking tools : hand drills : drill bits : twist drill bits

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
James E. Arnold
Frank H. Arnold

Patent Dates:
Granted: Aug. 22, 1871

Patent Pictures:
USPTO pdf tiff
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