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| All Patents in class 335/245 | |||||
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| Number | Date | Patentee | Title | Type | |
| 894,782 | Jul. 28, 1908 | G.H. Rowe | Rock hammer-drill | handheld power hammers | |
| 1,696,615 | Dec. 25, 1928 | P. Trombetta | Electromagnet | motor controls | |