4. Optical: systems and elements
  5. Compound lens system
  6. Telescope

Learning Technologies Inc.

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Planetarium and point light source for use in same

Optics: image projectors – Projected image combined with real object
Reexamination Certificate

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Sunspotter solar telescope

Optical: systems and elements – Compound lens system – Telescope
Reexamination Certificate

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Sunspotter solar telescope

Optical: systems and elements – Compound lens system – Telescope
Reexamination Certificate

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