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This product are mainly used in situations manhole covers stolen.When the outer ring was squeezed, the sensor can squeeze the stored energy into electrical energy.When the manhole covers were stolen,switch will bounce.And light tube will turn to red.This product can Avoid much accidents.
Zhejiang University, Ningbo Institute of Technology
Ningbo, China
Zhejiang University, Ningbo Institute of Technology
Ningbo, China
Riyu Liu
Lu Liu
Hui Shen