{HEAD ~ A cathodic arc cathode} is provided with an insulating ring in close proximity to the underside of the cantilevered edge of the target, and with no other conducting surface exposed in {TAIL ~ the coating system} 
{ HEAD ~ A cathodic arc cathode } is provided with an insulating ring in close proximity to the underside of the cantilevered edge of the target , and with no other conducting surface exposed in { TAIL ~ the coating system }
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