The Lucy Baldwin nitrous oxide and oxygen machine.
D000698:Analgesia; D000758:Anesthesia; D000760:Anesthesia and Analgesia; D000773:Anesthesia, Obstetrical / Q000600:supply & distribution*; D004864:Equipment and Supplies; D006801:Humans; D009609:Nitrous Oxide; D009774:Obstetrics; D010100:Oxygen; D059408:Pain Management
D009609:Nitrous Oxide; D010100:Oxygen
ANESTHESIA, OBSTETRICAL/equipment and supplies; NITROUS OXIDE/anesthesia and analgesia