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| Patents for R. M. Stone | |||||
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| Number | Date | Patentee | Title | Type | |
| 775,282 | Nov. 15, 1904 | R. Raddatz | Electric furnace | industrial furnaces | |
| 923,591 | Jun. 01, 1909 | C.G. Sprado | Gas Engine | internal combustion engine governors | |