4. Optical: systems and elements
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Chromatic vignetting in lens systems

Optical: systems and elements – Lens – With light limiting or controlling means
Reexamination Certificate

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Combined on-axis and off-axis illumination

Optical: systems and elements – Lens – With light limiting or controlling means
Reexamination Certificate

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Compact lens with external aperture stop

Optical: systems and elements – Lens – With light limiting or controlling means
Reexamination Certificate

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Contrast reinforcement for displays

Optical: systems and elements – Lens – With light limiting or controlling means
Reexamination Certificate

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Controllable horizon diaphragm for planetaria

Optical: systems and elements – Lens – With light limiting or controlling means
Patent

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