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Scrolling color changer

Optical: systems and elements – Absorption filter – Neutral or graded density
Reexamination Certificate

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Scrolling primary color changer

Optical: systems and elements – Absorption filter – Neutral or graded density
Patent

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Solid colloidal optical wavelength filter

Optical: systems and elements – Absorption filter – Fluid
Patent

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Spatial filter, a system and method for collecting light...

Optical: systems and elements – Absorption filter – Filters in optical parallel
Reexamination Certificate

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Spectrum filter wheel

Optical: systems and elements – Absorption filter – With support or frame
Reexamination Certificate

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Superconducting reflection filter

Optical: systems and elements – Absorption filter
Patent

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Superconducting searching filter

Optical: systems and elements – Absorption filter
Patent

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Superconducting submicron filter

Optical: systems and elements – Absorption filter
Patent

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Superconducting tunable inorganic filter

Optical: systems and elements – Absorption filter
Patent

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