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US Patent: 94,503
Improvement in Rasps
Patentee:
William T. Nicholson - 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:
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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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