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US Patent: 137,373
Improvement in Adjustable Bits Adjustable Countersink Bit-Assembly
Patentee: Fredrick Jonas (exact or similar names) - Burlington, IA USPTO Classifications: 408/192, 408/193 Tool Categories: woodworking tools : hand drills : drill bits : countersinks woodworking tools : hand drills : drill bits : adjustable drill bits Assignees: Fredrick Jonas - Burlington, IA George O. Ray - Burlington, IA Manufacturer: Unknown Witnesses: J. J. Tunnicliff M. H. Barringer	Patent Dates: Applied: Aug. 17, 1872 Granted: Apr. 01, 1873 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Jeff Joslin (dm)

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