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Application filed by Josef Ing Zeitler, Rostislav Ing HanakfiledCriticalJosef Ing Zeitler
Priority to CS837547ApriorityCriticalpatent/CS243078B1/en
Publication of CS754783A1publicationCriticalpatent/CS754783A1/en
Publication of CS243078B1publicationCriticalpatent/CS243078B1/en