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Pearl loupe

Optics: measuring and testing – Crystal or gem examination
Patent

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Process and apparatus for ascertainment of the valuation data of

Optics: measuring and testing – Crystal or gem examination
Patent

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Process and apparatus for detecting inclusions

Optics: measuring and testing – Crystal or gem examination
Patent

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Process and device for detecting inclusions in crystals

Optics: measuring and testing – Crystal or gem examination
Patent

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Process for measuring the surface of a polished precious stone

Optics: measuring and testing – Crystal or gem examination
Reexamination Certificate

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