The motor controller sends out {TAIL ~ a signal} to control {HEAD ~ an electric motor} and turbine to generate the desired inspiratory and expiratory pressures 
The motor controller sends out { TAIL ~ a signal } to control { HEAD ~ an electric motor } and turbine to generate the desired inspiratory and expiratory pressures
OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH