The weight of the descender , tension force and friction force are utilized to design the speed controllable mini evacuation device.
This patented commodity adopts a special rope, super fiber, and is characterize by its high tension, high strength
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FONG HWANG ENTERPRISE CO., LTD.VIP会员第12年
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The weight of the descender , tension force and friction force are utilized to design the speed controllable mini evacuation device.
This patented commodity adopts a special rope, super fiber, and is characterize by its high tension, high strength
