US Patent: 177,070
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| Improvement in Files
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Patentee:
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| William T. Nicholson (exact or similar names) - Providence, RI |
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Patent Dates:
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| Applied: |
Dec. 16, 1875 |
| Granted: |
May 09, 1876 |
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Russ Allen.
"Vintage Machinery" entry for W. T. Nicholson
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Description: |
| 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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