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'Bridge' fused trifocal lens
20th c.
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'Clarlet ST 28' trifocal lens
Zeiss
20th c.
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'Cromwell' fused trifocal lens
20th c.
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'Igard' trifocal lens
Combined Optical Industries Ltd
1961
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'Occupational' trifocal lens
Sola Optical Co
20th c.
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'Occupational' trifocal lens
Sola Optical Co
20th c.
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'Orma' concentric trifocal lens
Essilor
1963
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'Quintex' fused concentric downcurve trifocal lens & envelope
Haussmann
20th c.
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'Supervis 45' Solid concentric trifocal lens demonstrator
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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'Tri-Vue, D on D' fused trifocal lens
20th c.
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'Trivis' fused trifocal lens
United Kingdom Optical Company Ltd
20th c.
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'Vision-Ease' fused trifocal lens
20th c.
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A. J. Cross' 'CV' lenses in rimless spectacle frame
American Optical Company
c.1923
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Double 'Univis' ('Academy') fused trifocal lens
United Kingdom Optical Company Ltd
20th c.
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Double 'Univis' ('Academy') fused trifocal lens
United Kingdom Optical Company Ltd
20th c.
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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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Polycarbonate S728 trifocal lens
20th c.
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Solid concentric invisible downcurve trifocal lens
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Trifocal lens
Sola Optical Co
20th c.
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Trifocal lens
Bausch & Lomb
20th c.
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Trifocal lens
20th c.
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Uni-lite Ultra 7CV trifocal lens
c.1967
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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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