1. vision. At lower oxygen flows we agree with the remark made by Cotes,1956
2. Oxygen masks;Ball, J.A.C.;Brit. J. Anaesth,1963
3. A method of controlled oxygen administration which reduces the risk of carbon-dioxide retention;Campbell, E.J.M.;Lancet,1960
4. Masks and tents for providing controlled oxygen concentrations;Campbell, E.J.M.; Gebbie, T.;Ibid,1966
5. A new mask for delivering oxygen or other gases. Brit;Catterall, M.;med. J,1960