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Application filed by Pavel HaladafiledCriticalPavel Halada
Priority to CS87507ApriorityCriticalpatent/CS265110B1/en
Publication of CS50787A1publicationCriticalpatent/CS50787A1/en
Publication of CS265110B1publicationCriticalpatent/CS265110B1/en
CS87507A1987-01-241987-01-24
Involvement for measuring displacement and convergence of surface and mine workings in large and small spaces
CS265110B1
(en)