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| Patents for R. Denne | |||||
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| Number | Date | Patentee | Title | Type | |
| 237,764 | Feb. 15, 1881 | E. Medden | Rotary pump | rotary pumps | |
| 238,603 | Mar. 08, 1881 | E. Medden | Rotary engine | rotary steam engines | |
| 242,672 | Jun. 07, 1881 | E. Medden | Journal-box | pump bearings | |