4. Optical: systems and elements
  5. Optical aperture or tube, or transparent closure
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Safety shutter

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

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Sight glass assembly

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

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Slotted peep

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

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Stress relieved frame

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

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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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Weldable sightglass assembly

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

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Windshield for head-up display system

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

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Windshield for head-up display system

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

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