4. Optics: measuring and testing
  5. Refraction testing

Hideyuki Amamiya

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Portable refractometer

Optics: measuring and testing – Refraction testing – Prism engaging specimen
Reexamination Certificate

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Refractometer

Measuring – testing – or signalling instruments – Measuring – regulating or indicating instrument – or casing – Electrical property
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Refractometer

Optics: measuring and testing – Refraction testing
Reexamination Certificate

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Refractometer

Optics: measuring and testing – Refraction testing
Reexamination Certificate

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