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Application filed by Jaroslav Zavrel, Josef Zoudlik, Pavel Zak, Pavel DolezanfiledCriticalJaroslav Zavrel
Priority to CS863898ApriorityCriticalpatent/CS252640B1/en
Publication of CS389886A1publicationCriticalpatent/CS389886A1/en
Publication of CS252640B1publicationCriticalpatent/CS252640B1/en