centrifugal sand mixer

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Sand casting — Sand casting, also known as sand molded casting, is a metal casting process characterized by using sand as the mold material. It is relatively cheap and sufficiently refractory even for steel foundry use. A suitable bonding agent (usually clay)… … Wikipedia
Abrasive blasting — Sandblasting a stone wall Diesel powered compressor used as an air supply for sandblasting … Wikipedia

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