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Engraved gemstone viewer

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

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Engraved gemstone viewer

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

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Etch pit density measuring method

Optics: measuring and testing – Crystal or gem examination
Patent

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Examining a gemstone

Optics: measuring and testing – Crystal or gem examination
Patent

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Exploration method for finding uranium ore bodies

Optics: measuring and testing – Crystal or gem examination
Patent

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