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| All Patents in class 200/51.09 | |||||
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| Number | Date | Patentee | Title | Type | |
| 3,346,709 | Oct. 10, 1967 | A.I. Appleton | Explosion-proof plug and receptacle with releasable socket engaging means | electrical devices | |
| 3,524,072 | Aug. 11, 1970 | A.N. Tsergas | Electrical socket for selectively supplying different voltages | ||