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| All Patents in class 200/80A | |||||
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| Picture | Number | Date | Patentee | Title | |
| 1,983,502 | Dec. 04, 1934 | H.P. Vaughan | Control Means | ||
| 3,094,595 | Jun. 18, 1963 | O. Hermann | Zero Speed Switch | ||
 | 3,098,906 | Jul. 23, 1963 | O. Hermann | Zero speed switch | |
| 3,226,514 | Dec. 28, 1965 | O. Hermann | Screw Type Zero Speed Switch | ||