Clinical mask for breathing and rebreathing mixtures of gases. No. 2,452,722.
D000758:Anesthesia / Q000295:instrumentation*; D000769:Anesthesia, Inhalation / Q000295:instrumentation*; D000776:Anesthesiology; D005740:Gases; D013502:General Surgery; D006801:Humans; D008397:Masks; D010330:Patents as Topic; D012119:Respiration; D013523:Surgical Equipment
D005740:Gases
ANESTHESIA/apparatus; SURGERY/apparatus--patents