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Application filed by Vladimir Ing Spilka, Oldrich Hradil, Petr SpilkafiledCriticalVladimir Ing Spilka
Priority to CS87378ApriorityCriticalpatent/CS261984B1/en
Publication of CS37887A1publicationCriticalpatent/CS37887A1/en
Publication of CS261984B1publicationCriticalpatent/CS261984B1/en