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安全插头 / safety socket


safety socket.
similar to the key.
Lock the security.
Protect children.
No worry about the children's security,
work when energized.
When no plug or the plug can be pulled out,
the socket has no electricity.
When the socket has electricity,
the plug must have been inserted,
and can not be pulled down.


Ningbo Institute of Technology,Zhejiang University

Ningbo Institute of Technology,Zhejiang University
NingBo, China