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Application filed by Frantisek Beranek, Jiri Ing Bobek, Josef StusakfiledCriticalFrantisek Beranek
Priority to CS876815ApriorityCriticalpatent/CS263704B1/en
Publication of CS681587A1publicationCriticalpatent/CS681587A1/en
Publication of CS263704B1publicationCriticalpatent/CS263704B1/en