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Application filed by Jan Ing Matulka, Josef Ing FrankfiledCriticalJan Ing Matulka
Priority to CS837540ApriorityCriticalpatent/CS245216B1/en
Publication of CS754083A1publicationCriticalpatent/CS754083A1/en
Publication of CS245216B1publicationCriticalpatent/CS245216B1/en