Staffan B. Persson

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Adjustable support

Optics: eye examining – vision testing and correcting – Spectacles and eyeglasses – Folding
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Alignment system and ophthalmic instrument incorporating the sam

Optics: measuring and testing – Range or remote distance finding – Triangulation ranging to a point with two or more projected...
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Compact subjective refractive instrument

Optics: eye examining – vision testing and correcting – Spectacles and eyeglasses – Folding
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Control means

Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
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Optical apparatus for varying focal power along one principal me

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Profile ID: LFUS-PAI-P-675232

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