Hewitt's nitrous oxide-oxygen inhaler.
Ball
C
C
D000769:Anesthesia, Inhalation / Q000266:history* / Q000295:instrumentation; D000776:Anesthesiology / Q000266:history; D004867:Equipment Design; D049672:History, 19th Century; D006801:Humans; D009330:Nebulizers and Vaporizers / Q000266:history*; D009609:Nitrous Oxide / Q000008:administration & dosage / Q000266:history*; D010100:Oxygen / Q000008:administration & dosage / Q000266:history*; D006113:United Kingdom
D009609:Nitrous Oxide; D010100:Oxygen