4. Optical: systems and elements
  5. Glare or unwanted light reduction
  6. With absorption means
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Optical low pass filter and imaging device using the same

Optical: systems and elements – Glare or unwanted light reduction – With absorption means
Patent

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Optical observation instrument having a device for...

Optical: systems and elements – Glare or unwanted light reduction – With absorption means
Reexamination Certificate

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Optical screen apparatus having alternate opaque and clear...

Optical: systems and elements – Glare or unwanted light reduction – With absorption means
Reexamination Certificate

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