4. Optics: image projectors
  5. Stencil or perforated plate projector
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Projector and process for creating a night-sky illusion

Optics: image projectors – Stencil or perforated plate projector
Patent

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Projector for use in planetarium

Optics: image projectors – Stencil or perforated plate projector
Reexamination Certificate

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