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US Patent: 191,811
Improvement in File Holders
William T. Nicholson - Providence, RI

USPTO Classifications:
206/509, 407/29.15

Tool Categories:
metalworking tools : files

Nicholson File Co. - Providence, RI

Not known to have been produced

George Fuller
Thomas F. Cosgrove

Patent Dates:
Applied: Mar. 15, 1877
Granted: Jun. 12, 1877

Patent Pictures:
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File holder that allows the file to be sprung or bent which is preferred on large surfaces and the convex surface also makes the file less likely to clog or glaze.

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