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Application filed by Hromek Frantisek, Otakar Ing Frank, Frantisek Ing Sotola, Jaroslav SladecekfiledCriticalHromek Frantisek
Priority to CS856876ApriorityCriticalpatent/CS251840B1/en
Publication of CS687685A1publicationCriticalpatent/CS687685A1/en
Publication of CS251840B1publicationCriticalpatent/CS251840B1/en