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| Patent US616,643 | |||||
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| Number | Date | Patentee | Title | Type | |
| 616,643 | Dec. 27, 1898 | E.B. Tree | Rotary Engine | rotary steam engines | |
| DE-616,643 | Aug. 08, 1935 | H.H. Asbridge | Spitzenlose Schleifmaschine | ||