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| All Patents in class 172/36 | |||||
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| Number | Date | Patentee | Title | Type | |
| 96,332 | Nov. 02, 1869 | G. Little | Improvement in Electro-Magnetic Motors | electric motors | |
| 1,652,401 | Dec. 13, 1927 | F.P. Forss | Air cooling for electric drill | handheld power drills | |