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| Patents for R. D. Knowles | |||||
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| Number | Date | Patentee | Title | Type | |
| 201,366 | Mar. 19, 1878 | J.B. Stockham | Improvement in planing-machines | wood planers | |
| RE12,102 | Mar. 17, 1903 | O.M. Morse | Dust-collector | waste collection mechanisms | |