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US Patent: 97,818
Improvement in Twist-Drills
Patentee:
Socrates Scholfield - Providence, RI

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:
A. G. Scholfield
A. R. Abbott

Patent Dates:
Granted: Dec. 14, 1869

Patent Pictures:
USPTO pdf tiff
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Description:
Scholfield sums up his patent:

"A twist, or other similar drill, marked with distinct centre-guiding lines or grooves ..., for the purpose of indicating the proper position of the inner corner of each lip in grinding."

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