Tubes.
D004739:England; D005769:Gastrointestinal Motility; D049672:History, 19th Century; D049673:History, 20th Century; D049690:History, Ancient; D006801:Humans; D007441:Intubation, Gastrointestinal / Q000266:history* / Q000295:instrumentation; D010414:Pennsylvania; D011312:Pressure; D012384:Rome