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hands-prevent elevator / hands-prevent elevator

hands-prevent elevator
hands-prevent elevator

When you want to keep the elevator open ,there is a chance
that your hards will be crushed.So there are some hidden
dangers.The special elevator which places the induction
zone out of the door. You can use the elevator as usual
without safety risks in this way.

University

College of Science&Technology

College of Science&Technology
Ningbo university
ningbo, China

lei shi,
College of Science&Technology Ningbo University

Liyuan Liu

Zhenwei Chen,Li Chen

Tingyu Chen