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| All Patents in class 418/88 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,861,168 | May 31, 1932 | W. Warren, J.H. Warren, E.C. Warren | Rotary Engine | rotary steam engines | |
| 2,545,453 | Mar. 20, 1951 | F.P. Forss | Portable rotary grinder or die filer | handheld power tools | |