| http://www.w3.org/ns/prov#value | - Still another characteristic of the present invention is a membrane-electrodes assembly comprising a solid polymer electrolyte membrane obtained by the use of a polyether ether sulfone having sulfonic acid groups bonded thereto through alkylene groups which is represented by any of the formulas [1] to [9] exhibited hereinafter, said solid polymer electrolyte membrane being coated with the above-me
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