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This is a specifically for “hand operation” there is an obstacle in the design of products, when clean the ground or other steps have barriers or water stains, only need to hand, hand back. So products tail will can bend the material passive and driven by folding the clean part. Inside the product has the advantages of simple structure, easy to push the wheel outside, hope to help bring some changes.
Xi'an University of Technology
Shaanxi Xi'an, China