4. Optics: measuring and testing
  5. Crystal or gem examination

Robert W. Ditchburn

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Assessing the color of gemstones and the like

Optics: measuring and testing – Crystal or gem examination
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Sorting

Classifying – separating – and assorting solids – Sorting special items – and certain methods and apparatus for... – Condition responsive means controls separating means
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Profile ID: LFUS-PAI-P-208482

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