4. Classifying, separating, and assorting solids
  5. Sifting
  6. Plane sifters

Bo G. Backman

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Apparatus and method for drawing curves

Geometrical instruments – Scriber – Straight-line
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Apparatus for separating fine material from coarse material

Classifying – separating – and assorting solids – Sifting – Plane sifters
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