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US Patent: 7,589
Expansible bit
Patentee:
Clinton L. Adamcourt - Troy, NY

USPTO Classifications:
408/26, 82/1.4

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

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
A. Snyder
E. L. Brundage

Patent Dates:
Granted: Aug. 27, 1850

Patent Pictures:
USPTO pdf tiff
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