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Application filed by Karel Gabriel, Eduard Steif, Frantisek Smolik, Vaclav SabekfiledCriticalKarel Gabriel
Priority to CS804743ApriorityCriticalpatent/CS232205B1/en
Publication of CS474380A1publicationCriticalpatent/CS474380A1/en
Publication of CS232205B1publicationCriticalpatent/CS232205B1/en