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Application filed by Petr Ing Bacak, Haumer Jaroslav, Peterka VlastimilfiledCriticalPetr Ing Bacak
Priority to CS827696ApriorityCriticalpatent/CS243511B1/en
Publication of CS769682A1publicationCriticalpatent/CS769682A1/en
Publication of CS243511B1publicationCriticalpatent/CS243511B1/en