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