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| All Patents in class 200/38R | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,173,460 | Feb. 29, 1916 | C.A. Palmgren | Electric switch | electric switches | |
| 2,848,569 | Aug. 19, 1958 | R.Y. Moss, S.H. Durbin | Automation control device | metalworking presses | |