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Application filed by Wolfgang Boehm, Herbert Hecker, Harry Heidrich, Horst Hernichel, Wolfgang Koch, Gotthold May, Martin Mueller, Heinz Ossig, Guenter SeidelfiledCriticalWolfgang Boehm
Publication of CS713782A1publicationCriticalpatent/CS713782A1/en
Publication of CS241997B1publicationCriticalpatent/CS241997B1/en