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Application filed by Perner Bohumil, Kvapil Jiri, Kvapil Josef, Helena HilgerovafiledCriticalPerner Bohumil
Priority to CS862791ApriorityCriticalpatent/CS252625B1/en
Publication of CS279186A1publicationCriticalpatent/CS279186A1/en
Publication of CS252625B1publicationCriticalpatent/CS252625B1/en