Esmarch's mask.
Ball
C
C
D000769:Anesthesia, Inhalation / Q000266:history* / Q000295:instrumentation; D000776:Anesthesiology / Q000266:history; D005858:Germany; D049672:History, 19th Century; D049673:History, 20th Century; D006801:Humans; D008397:Masks / Q000266:history*; D008887:Military Medicine / Q000266:history