4. Optics: measuring and testing
  5. By polarized light examination
  6. With light attenuation

Chapman Instruments

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Automated optical surface profile measurement system

Optics: measuring and testing – By polarized light examination – With light attenuation
Patent

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System for locating and measuring an index mark on an edge...

Radiant energy – Photocells; circuits and apparatus – With circuit for evaluating a web – strand – strip – or sheet
Reexamination Certificate

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