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| Patents for R. W. Johnson | |||||
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| Number | Date | Patentee | Title | Type | |
| 171,870 | Jan. 04, 1876 | A. Saur | Improvement in door-sills | ||
| 218,155 | Aug. 05, 1879 | R.P. Bell | Improvement of Watchmakers Lathe Chucks | metal lathe chucks | |