This is a model lifting bridge with hydraulic & motor-pulley both facilities are available in it.Hydraulic jacks are represented here by injections(available in medicine shop) and motor-pulleys are represented as two 10 rpm geared motor(available in amazon) and normal rope,and the whole assembly is made up of ice cream steaks,and assembled by glue gun & glue sticks(available in amazon).This concept is very helpful in college Tech-Fest with different modifications in truss body.
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