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Application filed by Pavel Ing Hrstka, Jaroslav Ing VapenikfiledCriticalPavel Ing Hrstka
Priority to CS837038ApriorityCriticalpatent/CS238756B1/en
Publication of CS703883A1publicationCriticalpatent/CS703883A1/en
Publication of CS238756B1publicationCriticalpatent/CS238756B1/en