US Patent: 97,818 - Improvement in Twist-Drills


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US Patent: 97,818

Improvement in Twist-Drills

Patentee:

Socrates Scholfield (exact or similar names) - 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:

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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."