| http://www.w3.org/ns/prov#value | - Thus, in Kemmermeyer US. Pat. 2,966,235, issued Dec. '27, 1960, there is disclosed a method of separating carbon dioxide from a gas mixture containing carbon dioxide and other gases, such as hydrogen, nitrogen, oxygen and helium by permeation of the gases through a thin, non-porous silicone rubber membrane.
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