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| All Patents in class 200/308 | |||||
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| Number | Date | Patentee | Title | Type | |
| 324,635 | Aug. 18, 1885 | M. Bacon | Electrical indicator | ||
| 1,702,245 | Feb. 19, 1929 | S.D. Black, A.G. Decker | Electrical connection for portable electric tools | handheld power tools | |
| 2,848,569 | Aug. 19, 1958 | R.Y. Moss, S.H. Durbin | Automation control device | metalworking presses | |