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Application filed by Vaclav Petrik, Frantisek Molnar, Jan IvancofiledCriticalVaclav Petrik
Priority to CS827918ApriorityCriticalpatent/CS232220B1/en
Publication of CS791882A1publicationCriticalpatent/CS791882A1/en
Publication of CS232220B1publicationCriticalpatent/CS232220B1/en