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When we measure the length of the object, it is inconvenient to find a pencil and also to use two hands to operate for us, in this design, special moveable structural equipment which could lock the pencil is designed, thus work is more efficient because the problem of two-hand operation is solved. This is a pleasant design.
Beihua University
Jilin, China
Beihua University
Jilin, China
He Sun,Yanyu Yao,Xianzhong Shang,Peipeng Zhang