Method and apparatus for monitoring the surface contact of {HEAD ~ a neutral electrode} of {TAIL ~ a HF surgical apparatus} 
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Method and apparatus for monitoring the surface contact of { HEAD ~ a neutral electrode } of { TAIL ~ a HF surgical apparatus }
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL