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Used Grinding Machines Metal Grinders for Sale. Grinding Milling Machines and The first grinding machines were used in the 12 th century as grinding mills, a hand grinding machine or used CNC grinders . Get Price. Gypsum Grinding Mill manufacturers MadeinChina. China Gypsum Grinding Mill manufacturers Lm130 Gypsum Grinder Mill with High Quality grinding mill, grinding machine, milling ...