control means for applying {TAIL ~ hydraulic fluid} to said motors for rotating said screw conveyors, for regulating 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 { TAIL ~ hydraulic fluid } to said motors for rotating said screw conveyors , for regulating 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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