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| All Patents in class 123/248 | |||||
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| Number | Date | Patentee | Title | Type | |
| 570,470 | Nov. 03, 1896 | L. Gathman | Rotary Gas Engine | rotary engines | |
| 650,661 | May 29, 1900 | V.R. Stewart | Rotary Internal Combustion Engine | rotary engines | |