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Application filed by Jindrich Ing Vavrina, Jiri DuchoslavfiledCriticalJindrich Ing Vavrina
Priority to CS823512ApriorityCriticalpatent/CS232259B1/en
Publication of CS351282A1publicationCriticalpatent/CS351282A1/en
Publication of CS232259B1publicationCriticalpatent/CS232259B1/en