Furthermore, {HEAD ~ another object} of the present is to provide {TAIL ~ greater safety} to patients and medical or dental persons during release of nitrous oxide in a medical or dental office 
Furthermore , { HEAD ~ another object } of the present is to provide { TAIL ~ greater safety } to patients and medical or dental persons during release of nitrous oxide in a medical or dental office
OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH