Nitrous oxide cylinders on anaesthetic machines.
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D000776:Anesthesiology / Q000295:instrumentation*; D018685:Anesthetics, Inhalation; D004349:Drug Packaging; D006801:Humans; D009609:Nitrous Oxide; D012308:Risk Management / Q000379:methods
D018685:Anesthetics, Inhalation; D009609:Nitrous Oxide