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Both circular and longitudinal piles are used for blending raw materials in the cement industry. The materials are stacked in a great number of layers, and blending is obtained by reclaiming a mixture from all these layers. During the last 10 years, it has become common to mix a number of different materials in such piles. P. Gy pointed out more than 20 years ago that the Theory of Sampling (TOS)...
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