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Balkformat byggelement av haerdbart material, saett att tillverka detta samt saett att utfoera en raeller stomme till en byggnad eller del av en saodan med anvaendning av saodana byggelement
(p-nitrobenzyl eller beta, beta, beta, - trikloretyl)-6alfa-brom-2beta-klormetyl-2alfa-metylpenam-3 alfa-karboksylat-sulfoksyd og fremgangsmaate til fremstilling derav.