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Univis B fused bifocal lens View |
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Univis D fused bifocal demonstrator & case United Kingdom Optical Company Ltd Mid 20th c. View |
Univis D fused bifocal lens View |
Essilor 20th c. View |
Essilor 20th c. View |
Essilor 20th c. View |
Essilor 20th c. View |
Emerson-Bentzon 20th c. View |
20th c. View |
Window display of Kryptok Invisible Fused Bifocal manufacturing process 1930s View |
1970s View |
20th c. View |
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