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Application filed by Vaclav Ing Simmer, Otakar KostelnikfiledCriticalVaclav Ing Simmer
Priority to CS847155ApriorityCriticalpatent/CS244035B1/en
Publication of CS715584A1publicationCriticalpatent/CS715584A1/en
Publication of CS244035B1publicationCriticalpatent/CS244035B1/en