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safe wall outlet and attaching plug
This is a convenient attaching plug, especially it is used expediently in the evening or in the dark. It is particularly well adapted for use by the blind and child. This design used annular electrode .there is no direction and corresponding hole.
Sichuan Normal University
Chendu, China
Liu GuangKui
Qin Dong
Sichuan Normal University
Chendu, China
Liu Kai
Wang YingPeng
Deng ZhengJun
Wu XiaoYan