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Labatory Size Rock Crusher Sand Machine Pancing

Jul 24, 2021 The method of Protodyakonov rock classification is based on Protodyakonov scale to classify the hard rock and soft rock. f 15-20 Extremely strong rocks, such as very strong granite, limestone, quartzite, etc. f 8-10 Strong rocks, such as strong granite, strong sandstone, etc. f 4-6 Medium strength rocks, such as common sandstone, iron ore, etc.

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