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US Patent: 21,597
Expansive bit
Patentee:
William A. Clark - Bethany, CT

USPTO Classifications:
408/194, 408/195

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

Assignees:
None

Manufacturer:
W. A. Clark & Co. - Westville, CT

Witnesses:
Charles H. Shepard
James H. Gridley

Patent Dates:
Granted: Sep. 28, 1858

Patent Pictures:
USPTO pdf tiff
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Description:
This bit was featured in Scientific American article in their 1861-05-04 issue.

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