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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: USPTO (New site tip) Google Patents Report data errors or omissions to steward Jeff Joslin (dm)

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