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| Patents for W. R. Johnson | |||||
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| Number | Date | Patentee | Title | Type | |
| 6,039 | Jan. 16, 1849 | H. Knowles | Bearing for upright shafts | industrial machine bearings | |
| 6,370 | Apr. 17, 1849 | H. Knowles | Cutter for tonguing and grooving | cutters | |