{TAIL ~ Apparatus} for {HEAD ~ the supply} of breathable gas cyclically at an inspiratory pressure and a lower expiratory pressure substantially in synchronism with a patients respiration 
{ TAIL ~ Apparatus } for { HEAD ~ the supply } of breathable gas cyclically at an inspiratory pressure and a lower expiratory pressure substantially in synchronism with a patients respiration
TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH