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anvendning of a catalyst mixture of permanent and / or foreningar of oxides of the elements antimony, molybdenum, vanadium and tungsten and / or oxygen-containing foreningar of these elements, and of a berare for...
anvendning of a catalyst mixture of permanent and / or foreningar of oxides of the elements antimony, molybdenum, vanadium and tungsten and / or oxygen-containing foreningar of these elements, and of a berare for...