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| All Patents in class 200/214 | |||||
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| Number | Date | Patentee | Title | Type | |
| 3,098,906 | Jul. 23, 1963 | O. Hermann | Zero speed switch | electric switches | |
| 3,226,514 | Dec. 28, 1965 | O. Hermann | Screw Type Zero Speed Switch | engine lathes | |