RU1791035C SU914948386A SU4948386A RU1791035C RU 1791035 C RU1791035 C RU 1791035C SU 914948386 A SU914948386 A SU 914948386A SU 4948386 A SU4948386 A SU 4948386A RU 1791035 C RU1791035 C RU 1791035C Authority RU Russia Prior art keywords mill grinding charge ratio components Prior art date 1991-06 …