4. Optics: eye examining, vision testing and correcting
  5. Spectacles and eyeglasses
  6. Lens pivots in and out of optical path
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One-piece spectacle with hinge

Optics: eye examining – vision testing and correcting – Spectacles and eyeglasses – Lens pivots in and out of optical path
Patent

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Optical adjustment spectacles

Optics: eye examining – vision testing and correcting – Spectacles and eyeglasses – Lens pivots in and out of optical path
Reexamination Certificate

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Optical viewing accessory

Optics: eye examining – vision testing and correcting – Spectacles and eyeglasses – Lens pivots in and out of optical path
Patent

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