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