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Publication date
Application filed by Jaroslav Valecek, Jan HudecekfiledCriticalJaroslav Valecek
Priority to CS818784ApriorityCriticalpatent/CS237551B1/en
Priority to SU827772721Aprioritypatent/SU1418204A1/en
Priority to DD24441582Aprioritypatent/DD234153A3/en
Publication of CS878481A1publicationCriticalpatent/CS878481A1/en
Publication of CS237551B1publicationCriticalpatent/CS237551B1/en