control means for applying hydraulic fluid to said motors for rotating said screw conveyors, for regulating {TAIL ~ the operation} of the belt conveyors in the hopper truck, and for shutting off hydraulic fluid to said motors when the hydraulic pressure exceeds {HEAD ~ a predetermined valve} 
control means for applying hydraulic fluid to said motors for rotating said screw conveyors , for regulating { TAIL ~ the operation } of the belt conveyors in the hopper truck , and for shutting off hydraulic fluid to said motors when the hydraulic pressure exceeds { HEAD ~ a predetermined valve }
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