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Priority to PL26261686ApriorityCriticalpatent/PL152978B1/en
Publication of PL262616A1publicationCriticalpatent/PL262616A1/en
Publication of PL152978B1publicationCriticalpatent/PL152978B1/en
PL26261686A1986-11-251986-11-25Method for protecting swelling rock against water penetration,especially of swelling ground of mining excavations
PL152978B1
(en)