{HEAD ~ An improved torsional limiting device} and associated control system are incorporated in a large scale trencher between the power source and {TAIL ~ the cutting wheel} to provide for protection of the equipment components in the event the cutting wheel encounters unforeseen obstructions 
{ HEAD ~ An improved torsional limiting device } and associated control system are incorporated in a large scale trencher between the power source and { TAIL ~ the cutting wheel } to provide for protection of the equipment components in the event the cutting wheel encounters unforeseen obstructions
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