The Marrett apparatus.
I T
IT
Houghton
D000776:Anesthesiology / Q000266:history / Q000295:instrumentation; D018685:Anesthetics, Inhalation / Q000008:administration & dosage / Q000266:history*; D004867:Equipment Design; D049673:History, 20th Century; D006801:Humans; D006113:United Kingdom
D018685:Anesthetics, Inhalation