4. Optical: systems and elements
  5. Projection screen
  6. Border, mask, shade, or curtain
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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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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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