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Application filed by Josef Becvar, Miroslav Ing Valenta, Jan Ing StepanekfiledCriticalJosef Becvar
Priority to CS886975ApriorityCriticalpatent/CS270753B1/en
Publication of CS697588A1publicationCriticalpatent/CS697588A1/en
Publication of CS270753B1publicationCriticalpatent/CS270753B1/en