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Application filed by Bohumil Ing Csc Pidermann, Pokorny FrantisekfiledCriticalBohumil Ing Csc Pidermann
Priority to CS859198ApriorityCriticalpatent/CS255447B1/en
Publication of CS919885A1publicationCriticalpatent/CS919885A1/en
Publication of CS255447B1publicationCriticalpatent/CS255447B1/en