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US Patent: 170,527
Improvement in Expansible Tools For Cutting Holes of Different Sizes
Patentee:
Christopher Crammer (exact or similar names) - Turners Falls, MA

USPTO Classifications:
408/189, 408/195

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

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
W. D. Russell
Porter Farwell

Patent Dates:
Applied: Sep. 09, 1875
Granted: Nov. 30, 1875

Patent Pictures:
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