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Application filed by Blahoslav Fojtu, Jindrich Bilan, Milos ZencfiledCriticalBlahoslav Fojtu
Priority to CS328977ApriorityCriticalpatent/CS192780B1/cs
Publication of CS192780B1publicationCriticalpatent/CS192780B1/cs
CS328977A1977-05-191977-05-19Method of protection and isolation of the openings in the place of penetration with the layer of the utility mineral
CS192780B1
(en)