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| Patents for R. M. Stark | |||||
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| Number | Date | Patentee | Title | Type | |
| 372,001 | Oct. 25, 1887 | C.V. Woerd | Lathe for Forming Pivots of Balance Wheel Staffs | watchmakers lathes | |
| 372,002 | Oct. 25, 1887 | C.V. Woerd | Chuck for Watch Movement Plates | watchmaker | |
| 387,481 | Aug. 07, 1888 | G. Almorth | Protractor | protractors | |