| http://www.w3.org/ns/prov#value | - (A) an airway tube for supplying air to a patient; (B) an evacuation tube for communication with an esophageal inlet of the patient; (C) a mask adapted for sealed engagement with a laryngeal inlet of the patient, the mask including a back cushion for contacting a pharyngeal wall of the patient and biasing at least part of the mask away from the pharyngeal wall, a first portion of the back cushion
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