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Publication date
Application filed by Frantisek Ing PivonkafiledCriticalFrantisek Ing Pivonka
Priority to CS866643ApriorityCriticalpatent/CS255738B1/en
Publication of CS664386A1publicationCriticalpatent/CS664386A1/en
Publication of CS255738B1publicationCriticalpatent/CS255738B1/en