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US2268128A US230435A US23043538A US2268128A US 2268128 A US2268128 A US 2268128A US 230435 A US230435 A US 230435A US 23043538 A US23043538 A US 23043538A US 2268128 A US2268128 A US 2268128A Authority US United States Prior art keywords cylinder magnets materials concentrator brushes Prior art date 1938 09 17 Legal status The legal status is an assumption and is

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