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| Patents for R. W. Johnston | |||||
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| Number | Date | Patentee | Title | Type | |
| 220,291 | Oct. 07, 1879 | J. Kesselmeier | Improvement of Watchmakers Lathes | watchmakers lathes | |
| 286,409 | Oct. 09, 1883 | L. Emery, F.B. Stebbins | Cutter-head | cutterheads | |