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US Patent: 256,979
Extension-Bit and Washer-Cutter Washer Cutter and Adjustable Bit
Patentee: John W. Cooper (exact or similar names) - Philadelphia, PA USPTO Classifications: 408/147, 408/190, 408/192, 408/195 Tool Categories: woodworking tools : hand drills : drill bits : washer cutters Assignees: None Manufacturer: Not known to have been produced Witnesses: Cyrus Roose Sarah E. Cooper	Patent Dates: Applied: Sep. 01, 1881 Granted: Apr. 25, 1882 Patent Pictures: [ 1 | 2 ] USPTO (New site tip) Google Patents Report data errors or omissions to steward Jeff Joslin (dm)

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