| http://www.w3.org/ns/prov#value | - The porous carbon disc or layer 21g comprises an aggregation of porous globules or conglomerates containing carbon black and a binder such as Teflon and having a network of electrolyte-conducting channels formed throughout its entire mass for permitting the electrolytic solution 6 to permeate the layer 21g and the associated insulator disc 21f.
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