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ore concentrator magnetic machine

US588252A US588252DA US588252A US 588252 A US588252 A US 588252A US 588252D A US588252D A US 588252DA US 588252 A US588252 A US 588252A Authority US United States Prior art keywords frame secured ore over shaft Prior art date 18970817 Legal status The legal status is an assumption and is not a legal conclusion

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