Assertion: nitrous oxide | /r/ObjectUse | used in general anesthesia
Facets:
value: for over 2 centuries
type: TEMPORAL
Source sentences:
text: Nitrous oxide has been used in general anesthesia for over 2 centuries, but its use outside of the operating room began when Tunstall introduced the nitrous oxide/oxygen mixture as an analgesic agent during labor.
text: Nitrous oxide (medical) mixed with 30% oxygen is used in general anaesthesia.