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STAND DER ENTWICKLUNG DER STEINTRENNVORRICHTUNGEN FUER TAGEBAU-GROSSGERAETE UND VORSCHLAEGE FUER DEREN GESTALTUNG. = THE PRESENT STATUS OF DEVELOPMENT OF STONE SEPARATING DEVICES FOR THE MAJOR OPEN-CAST MINE EQUIPMENTS AND PROPOSALS FOR THEIR DESIGN = ETAT ACTUEL DES DISPOSITIFS DE SEPARATION DES PIERRES PROVENANT DES GROSSES MACHINES DES MINES A CIEL OUVERT: PERFECTIONNEMENTS PROPOSES.HITZSCHKE K.1978; NEUE BERGAUTECH.; DDR; DA. 1978; VOL. 8; NO 3; PP. 123-130; BIBL. 6 REF.Article