| http://www.w3.org/ns/prov#value | - g group and solid acid, fuel cell including the same, and method of preparing the polymer electrolyte membraneUS8211590 *Mar 14, 2006Jul 3, 2012Panasonic CorporationProton conducting material, and electrode and fuel cell using the sameUS8232025Dec 14, 2009Jul 31, 2012SOCI???T??? BICElectrochemical cells having current-carr
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