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US Patent: 177,070
Improvement in Files
William T. Nicholson - Providence, RI

USPTO Classifications:
407/29.1, 76/24.1

Tool Categories:
metalworking tools : files

Nicholson File Co. - Providence, RI

Nicholson File Co. - Providence, RI

J. C.B. Woods
Frank J. Arnold

Patent Dates:
Applied: Dec. 16, 1875
Granted: May 09, 1876

Patent Pictures:
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Improvement on Nicholson's Sept. 27, 1864 patent (no. 44,443). Each grouping of teeth has overall wider or narrower spacing than the adjacent grouping. The specifications mention parallel patents for the machinery to produce these files. Patents 177,071 through 177,074 relate to preparing the blank, and 177,075 describes the machine that cuts the file.

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