4. Classifying, separating, and assorting solids
  5. Magnetic
  6. Paramagnetic

F. W. Lutter

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Apparatus for dry placer mining and method of operating same

Classifying – separating – and assorting solids – Electrostatic – Stratifying
Patent

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Apparatus for treating a papermaking suspension

Classifying – separating – and assorting solids – Magnetic – Paramagnetic
Patent

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