4. Optical: systems and elements
  5. Optical aperture or tube, or transparent closure
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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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Method and apparatus for measuring hair density

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

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Method and apparatus for packaging optical elements

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

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Multi-image viewer apparatus

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

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