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This is a design of innovation on Locks of public washroom. First of all, the door knob will stick out and show green part. People can find the vacant cubicle when in a hurry.Secondly, door with this lock will lock automatically when it’s closed, Keeping knobs from being twisted.Thirdly, people can hang stuff on the door knob like umbrellas, canes and so on. Last but not least, there is a special device inside this knob, which keeps people outside from pushing the knob, but pulling. In this case, the door cannot be locked from outside.