4. Optical: systems and elements
  5. Lens
  6. With multipart element
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Optical system for enlarging images

Optical: systems and elements – Lens – With multipart element
Patent

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Optical unit and method for making the same

Optical: systems and elements – Lens – With multipart element
Reexamination Certificate

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Overhead projector with achromatic Fresnel lens

Optical: systems and elements – Lens – With multipart element
Patent

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Overhead projector with catadioptric fresnel lens

Optical: systems and elements – Lens – With multipart element
Patent

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