4. Radiant energy
  5. Photocells; circuits and apparatus
  6. Optical or pre-photocell system

Marc Le Menn

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Instrument for measuring the refractive index of a fluid

Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent

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Optical refractometer for measuring seawater salinity and...

Optics: measuring and testing – Refraction testing
Reexamination Certificate

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Profile ID: LFUS-PAI-P-1924294

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