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Fremgangsmaade til fremstilling af Skumglasformlegemer af Glasmel under Tilsætning af Stoffer, som ved de Temperaturer, hvorved Glasset bliver blødt afgiver Luftarter.
Fremgangsmaade til fremstilling af Skumglasformlegemer af Glasmel under Tilsætning af Stoffer, som ved de Temperaturer, hvorved Glasset bliver blødt afgiver Luftarter.