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When we use the socket,we cann't find the jacks clearly, so it's not easy to insert the plug into the jacks. We add
the notches on the jacks which are the equal of pathways, this design helps the plug slide into the jacks.
Shaanxi University of Science & Technology
xi`an, China
Shaanxi University of Science & Technology
xi`an, China
Shaobo Geng Liangbing Hu Danqiong Lu Longzhen Li
