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Application filed by Frantisek Ing Vasko, Ivan Ing Vasko, Karel DvorakfiledCriticalFrantisek Ing Vasko
Priority to CS881947ApriorityCriticalpatent/CS267284B1/en
Publication of CS194788A1publicationCriticalpatent/CS194788A1/en
Publication of CS267284B1publicationCriticalpatent/CS267284B1/en