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US Patent: 624,439
Expansion-Bit
Patentee: Abraham L. Adams (exact or similar names) - Bridgeport, CT USPTO Classifications: 408/194, 408/195, 408/197, 408/212, 408/213 Tool Categories: woodworking tools : hand drills : drill bits : adjustable drill bits Assignees: None Manufacturer: Not known to have been produced Witnesses: David M. Lackie J. W. Range	Patent Dates: Applied: Jul. 22, 1898 Granted: May 09, 1899 Patent Pictures: [ 1 | 2 ] USPTO (New site tip) Google Patents Report data errors or omissions to steward Jeff Joslin (dm)
Description: Claim is for a tapering base for the adjustable cutter, the purpose being to off-set the tendency of such cutters to creep outward during use.

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