4. Optical: systems and elements
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Aberration-free directional image window sheet

Optical: systems and elements – Projection screen – Unitary sheet comprising plural refracting areas
Patent

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Adjustable optical characteristic

Optical: systems and elements – Projection screen
Reexamination Certificate

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Adjustable viewing screen housing and display device

Optical: systems and elements – Projection screen – Roll up screen
Patent

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Adjustable-aspect video projection screen

Optical: systems and elements – Projection screen – Border – mask – shade – or curtain
Patent

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Ambient light absorbing screen

Optical: systems and elements – Projection screen – Unitary sheet comprising plural reflecting areas
Reexamination Certificate

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Apparatus and method for increasing blue component gain from a v

Optical: systems and elements – Projection screen – Embedded particles
Patent

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Apparatus for displaying image allowing observer to recognize st

Optical: systems and elements – Projection screen – Unitary sheet comprising plural refracting areas
Patent

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Apparatus for raising and lowering the lower screen mask in a mo

Optical: systems and elements – Projection screen – Border – mask – shade – or curtain
Patent

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