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There are many knobs on the precise instruments or all kinds of products. Usually,we deal with them unconsciously, and never know which direction is right.
The existing shape of the knobs is used to prevent slipping . The product tell people which direction is right beside the slipping prevention . Users can use this product both by vision and touch . However, the former knobs non-slip part doesnt have the instruction of direction ,so it failed to tell us which is the forward direction and which is the negative direction wih semasiology.
Zhao BIn Pang jianjun Huang jianbo Hu jie Wang yu