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Retractable Waring Cone is a combination of retractable belt and waring cone, which is more convinient and efficient when using and storing it. With it, the users won't have to carry numbers of waring cones like they did before. They can simply mark out the waring area by lengthening the belt.
Moreover, there is an optical fiber on the belt, which enhance the capability of catching person's attention who is passing by.
Siou-Ming Liang ,
Ming Chuan University