[Painless delivery by halothane inhalation using an anesthetic apparatus with nitrous oxide].
D000769:Anesthesia, Inhalation; D000773:Anesthesia, Obstetrical / Q000295:instrumentation; D005260:Female; D006221:Halothane / Q000008:administration & dosage*; D006801:Humans; D008722:Methods; D009609:Nitrous Oxide; D011247:Pregnancy
D009609:Nitrous Oxide; D006221:Halothane