4. Optics: measuring and testing
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Page identification by detection of optical characteristics

Optics: measuring and testing – By shade or color – Trichromatic examination
Patent

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Photoelectric densitometer

Optics: measuring and testing – By shade or color – Trichromatic examination
Patent

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Portable colorimeter

Optics: measuring and testing – By shade or color – Trichromatic examination
Reexamination Certificate

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Process for discriminating the color of a surface and apparatus

Optics: measuring and testing – By shade or color – Trichromatic examination
Patent

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