An improved torsional limiting device and {HEAD ~ 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 
An improved torsional limiting device and { HEAD ~ 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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