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artificial sand making process in united states

US1975504A US500283A US50028330A US1975504A US 1975504 A US1975504 A US 1975504A US 500283 A US500283 A US 500283A US 50028330 A US50028330 A US 50028330A US 1975504 A US1975504 A US 1975504A Authority US United States Prior art keywords filaments spinning wheel apparatus threads Prior art date 19291207 Legal status The legal status is an assumption and is ...As a leading global manufacturer of crushing equipment, milling equipment,dressing equipment,drying equipment and briquette equipment etc. we offer advanced, rational solutions for any size-reduction requirements, including quarry, aggregate, grinding production and complete plant plan.



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