| http://www.w3.org/ns/prov#value | - More specifically, the core 20 and the matrix 23 of electrode layers 21 and 22 can be composed of materials such as cellulose esters in which the esterifying acids contain up to 20 carbon atoms, and preferably up to six carbon atoms, such as cellulose acetate, cellulose acetate-butyrate, cellulose acetatepropionate, cellulose acetate-valerate', and
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