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Application filed by Polacek Bohumil, Stanislav PenazfiledCriticalPolacek Bohumil
Priority to CS868342ApriorityCriticalpatent/CS257647B1/cs
Publication of CS834286A1publicationCriticalpatent/CS834286A1/cs
Publication of CS257647B1publicationCriticalpatent/CS257647B1/cs