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| All Patents in class 310/75D | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,170,036 | Aug. 22, 1939 | R. Schumann | Small electric machine tool | handheld power tools | |
| 2,385,369 | Sep. 25, 1945 | R.A. Niekamp | Shaft coupling | industrial machine shaft couplings | |
| 2,696,569 | Dec. 07, 1954 | H.W. Schumann | Motor Tool | handheld grinders | |