4. Optics: image projectors
  5. Stencil or perforated plate projector
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Simplified planetarium apparatus and simplified image...

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

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System for simulating the appearance of the night sky inside a r

Optics: image projectors – Stencil or perforated plate projector
Patent

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