A nitrous oxide and oxygen supply, vacuum source, {HEAD ~ a breather bag}, and a nasal delivery interface system are fluidly connected to {TAIL ~ the fluid control system} and a patient 
A nitrous oxide and oxygen supply , vacuum source , { HEAD ~ a breather bag } , and a nasal delivery interface system are fluidly connected to { TAIL ~ the fluid control system } and a patient
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH