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Akin's spiral classifier

US2428789A US471989A US47198943A US2428789A US 2428789 A US2428789 A US 2428789A US 471989 A US471989 A US 471989A US 47198943 A US47198943 A US 47198943A US 2428789 A US2428789 A US 2428789A Authority US United States Prior art keywords sands flights tank spiral pool Prior art date 1943-01-11 Legal status (The legal status is an assumption and is not a legal conclusion

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