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US Patent: RE4,668
Improvement in expansive bits
Patentee:
William A. Clark (exact or similar names) - New Haven, CT

USPTO Classifications:
408/194, 408/195, 408/213

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

Assignees:
None

Manufacturer:
William A. Clark - Bethany, CT

Witnesses:
Jessie A. Clark
Susan B. Morris

Patent Dates:
Granted: Dec. 12, 1871

Reissue Information:
Reissue of RE3,733 (Nov. 16, 1869)

Patent Pictures:
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