4. Optical: systems and elements
  5. Compound lens system
  6. Telescope
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Branch image pickup and view system

Optical: systems and elements – Compound lens system – Telescope
Patent

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Brightness intensifier tube with alignment marker

Optical: systems and elements – Compound lens system – Telescope
Patent

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Building with roof mounted periscope

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

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