title: AN ASSESSMENT OF NITROUS OXIDE APPARATUS USED FOR OBSTETRIC ANALGESIA.
mesh_terms: D016362:Analgesia, Obstetrical; D000758:Anesthesia; D000773:Anesthesia, Obstetrical; D004864:Equipment and Supplies; D005260:Female; D006801:Humans; D009609:Nitrous Oxide; D009774:Obstetrics; D011247:Pregnancy
chemical_list: D009609:Nitrous Oxide
keywords: ANESTHESIA, OBSTETRICAL; EQUIPMENT AND SUPPLIES; NITROUS OXIDE; PREGNANCY