| http://www.w3.org/ns/prov#value | - A hydrogen permeable structure comprising a base made of a material including a porous ceramic, said base having a base surface with at least one pin hole in said base surface, a porous oxide material filling said at least one pin hole thereby making said base surface plane, a hydrogen permeable film including palladium and at least one element other than palladium on said plane base surface, said
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