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'Supervis 45' Solid concentric trifocal lens demonstrator
United Kingdom Optical Company Ltd
Mid-Late 20th c.
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United Kingdom Optical Company Ltd
Mid-Late 20th c.
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'Supervis' Solid concentric trifocal lens with prismatic near segment
United Kingdom Optical Company Ltd
1961
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United Kingdom Optical Company Ltd
1961
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Double circular segment fused trifocal lens
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Double upcurve trifocal lens
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Executive trifocal lens
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Executive-type trifocal lens
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Solid concentric invisible downcurve trifocal lens
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Up and downcurve solid trifocal lens
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Up and downcurve solid trifocal lens
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Up and downcurve trifocal lens
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