An elastically flexible pressing contact of transmitter and receiver on the skin surface can be provided by {HEAD ~ the air cushion} formed with {TAIL ~ the aid} of the two walls 
formed with
An elastically flexible pressing contact of transmitter and receiver on the skin surface can be provided by { HEAD ~ the air cushion } formed with { TAIL ~ the aid } of the two walls
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH