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Oriented Keyhole / Common design

Oriented Keyhole
Oriented Keyhole

When in the absence of light, will be key to smoothly inserted into the keyhole, and it's not easy, so I'll keyhole before design a has a slope of guiding role, can smoothly under the condition of the dark, insert the key.

University

Chengdu University of Technology

Chengdu University of Technology
Chengtu, China

Yuan Liu,
Chengdu University of Technology