Filters and Ayre's T-piece.
Marcus
R
R
Wandless
J
J
Thompson
J
J
D000403:Airway Resistance; D000769:Anesthesia, Inhalation / Q000295:instrumentation*; D005374:Filtration / Q000295:instrumentation*; D006801:Humans; D001239:Inhalation; D008397:Masks; D012121:Respiration, Artificial / Q000295:instrumentation*