{HEAD ~ a nasal delivery interface system} fluidly connected to {TAIL ~ the fluid control system}, said nasal delivery interface system including a single scavenging tube and a single nitrous oxide and oxygen tube fluidly connected to a nasal delivery mask 
fluidly connected to
{ HEAD ~ a nasal delivery interface system } fluidly connected to { TAIL ~ the fluid control system } , said nasal delivery interface system including a single scavenging tube and a single nitrous oxide and oxygen tube fluidly connected to a nasal delivery mask
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH