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finished products stone crushing

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finished products stone crushing

If the crushed or ground products pass through an 8mesh or finer screen the crushing or grinding operations shall be classified as 17411 Silica Grinding Stone crushing or silica grinding that is performed in connection with sand gravel or clay digging shall be classified as 40001 Sand or Gravel Digging if 25 or less of the excavated material is crushed or ground


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