Clearing the airway--the development of the pharyngeal airway.
Ball
C
C
Westhorpe
R
R
D000768:Anesthesia, General / Q000266:history*; D000776:Anesthesiology / Q000266:history; D004739:England; D049673:History, 20th Century; D007442:Intubation, Intratracheal / Q000266:history* / Q000295:instrumentation