{HEAD ~ A retractable cover system} for {TAIL ~ a tipper trailer body} of a truck includes a cover for the top of the trailer body , and a winder pulley for controlling the movement of the cover across the top of the trailer body  
{ HEAD ~ A retractable cover system } for { TAIL ~ a tipper trailer body } of a truck includes a cover for the top of the trailer body , and a winder pulley for controlling the movement of the cover across the top of the trailer body
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