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Application filed by Vaclav Bilek, Vaclav Kroc, Jan MalafiledCriticalVaclav Bilek
Priority to CS884424ApriorityCriticalpatent/CS270458B1/en
Publication of CS442488A1publicationCriticalpatent/CS442488A1/en
Publication of CS270458B1publicationCriticalpatent/CS270458B1/en