4. Optics: measuring and testing
  5. Of light reflection
  6. By comparison

John D. Michalski

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Methods and apparatus for detecting impurities in semiconductors

Optics: measuring and testing – Of light reflection – By comparison
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Methods and apparatus for sorting workpieces according to their

Classifying – separating – and assorting solids – Sorting special items – and certain methods and apparatus for... – Condition responsive means controls separating means
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