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US Patent: 313,735
Expansible bit
Patentee:
George H. Hill (exact or similar names) - Derby, CT

USPTO Classifications:
408/194, 408/195, 408/212, 408/213

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

Assignees:
George H. Hill - Derby, CT
William J. Welsh - Birmingham, CT

Manufacturer:
Excelsior Mfg. Co. - Unknown, Unknown

Witnesses:
A. F. Sherwood
William J. Clark

Patent Dates:
Applied: Jan. 23, 1885
Granted: Mar. 10, 1885

Patent Pictures: [ 1 | 2 ]
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