In operation, the present invention provides {HEAD ~ a system} for administering {TAIL ~ anesthesia/analgesia gas} which provides convenient and direct access to a medical practitioner 
for administering
In operation , the present invention provides { HEAD ~ a system } for administering { TAIL ~ anesthesia / analgesia gas } which provides convenient and direct access to a medical practitioner
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH