Report on the trial of prototype gas/oxygen analgesia apparatus.
D000698:Analgesia; D000758:Anesthesia; D000773:Anesthesia, Obstetrical / Q000600:supply & distribution*; D000776:Anesthesiology; D004864:Equipment and Supplies; D006801:Humans; D010100:Oxygen
D010100:Oxygen
ANESTHESIA, OBSTETRICAL/equipment and supplies