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| All Patents in class 91/433 | |||||
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| Number | Date | Patentee | Title | Type | |
| 255,236 | Mar. 21, 1882 | C.E. Ball | Electric drill | handheld power drills | |
| 1,536,951 | May 05, 1925 | R.A. Trace | Cake-forming machine | seed or nut oil apparatus | |