4. Optical: systems and elements
  5. Optical aperture or tube, or transparent closure
  6. Submerged object viewer
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Meter reading apparatus

Optical: systems and elements – Optical aperture or tube – or transparent closure – Submerged object viewer
Patent

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Portable underwater viewer with magnifying capabilities

Optical: systems and elements – Optical aperture or tube – or transparent closure – Submerged object viewer
Patent

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Underwater seeing device

Optical: systems and elements – Optical aperture or tube – or transparent closure – Submerged object viewer
Reexamination Certificate

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Viewing enhanced apparatus for visibility impaired fluid

Optical: systems and elements – Optical aperture or tube – or transparent closure – Submerged object viewer
Reexamination Certificate

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