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• Wortmann, J.; Dany, F. J.; Kandler, J.
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  Difficulty Inflammable Polyurethanes and Process for Making Them.
  Hoechst Aktiengesellschaft, Frankfurt, Germany
  U.S. Patent 3,850,859
  U.S. Patent 3,850,859
  November 26, 1974
  7 p.