4. Optical: systems and elements
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  6. Plural focal length
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Multi-facet lens component

Optical: systems and elements – Lens – Plural focal length
Patent

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Multi-focal length miniature refractive element and method...

Optical: systems and elements – Lens – Plural focal length
Reexamination Certificate

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Multi-focus system for a low light level vision apparatus

Optical: systems and elements – Lens – Plural focal length
Patent

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