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• Kopetz, K.; Ziegenbein, W.; Schick, A.
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  Fire-Retardant Polyolefin Compositions.
  Chemische Werke Huels Aktiengesellschaft, Marl, Germany
  U.S. Patent 3,883,481
  U.S. Patent 3,883,481
  May 13, 1975
  5 p.