4. Optical: systems and elements
  5. Projection screen
  6. Roll up screen
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Screen assembly with pivoting leg members

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

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Screen projection apparatus

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

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Screen system

Optical: systems and elements – Projection screen – Roll up screen
Reexamination Certificate

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Self-contained manual lifting screen

Optical: systems and elements – Projection screen – Roll up screen
Reexamination Certificate

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Sheet take-up device for a projection screen and the like

Optical: systems and elements – Projection screen – Roll up screen
Reexamination Certificate

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Symmetrical projection screen

Optical: systems and elements – Projection screen – Roll up screen
Reexamination Certificate

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