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Application filed by Jozef Ing Vacval, Frantisek Ing Gajdos, Julia Ing Durisova, Piskla Stefan, Jozef DurisfiledCriticalJozef Ing Vacval
Priority to CS861782ApriorityCriticalpatent/CS253428B1/en
Publication of CS178286A1publicationCriticalpatent/CS178286A1/en
Publication of CS253428B1publicationCriticalpatent/CS253428B1/en