O'Dwyer's tubes.
Westhorpe
R
R
D000776:Anesthesiology / Q000266:history* / Q000295:instrumentation; D001315:Australia; D002648:Child; D049672:History, 19th Century; D006801:Humans; D007440:Intubation / Q000266:history* / Q000295:instrumentation; D007830:Larynx; D012606:Scotland; D014481:United States