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US Patent: 94,503
Improvement in Rasps
Patentee: William T. Nicholson (exact or similar names) - Providence, RI USPTO Classifications: 407/29.1 Tool Categories: metalworking tools : files Assignees: Nicholson File Co. - Providence, RI Manufacturer: Not known to have been produced Witnesses: Benj. F. Thurston Peter F. Hughes	Patent Dates: Granted: Sep. 07, 1869 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Russ Allen. "Vintage Machinery" entry for W. T. Nicholson
Description: The cutting edge of each tooth is curved in two directions with the metal raised by the chisel a convex outer surface to provide a shearing cut.

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