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Application filed by Otomar Ing Stvrtna, Josef VitasekfiledCriticalOtomar Ing Stvrtna
Priority to CS875771ApriorityCriticalpatent/CS265969B1/en
Publication of CS577187A1publicationCriticalpatent/CS577187A1/en
Publication of CS265969B1publicationCriticalpatent/CS265969B1/en