The disk drive mechanism of {HEAD ~ the sensor dispensing instrument} is operated by pressing {TAIL ~ a button} which activates a motor 
The disk drive mechanism of { HEAD ~ the sensor dispensing instrument } is operated by pressing { TAIL ~ a button } which activates a motor
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH