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'Executive' (E-type) solid double bifocal lens
OPHTHALMIC LENSES
bifocal lens
20th c.
glass
1999.5513
OPHTHALMIC LENSES
bifocal lens
20th c.
glass
'Executive' (E-type) solid bifocal lens. Round. Glass. Double front surface segments sandwiching a rectangular plano section.
1999.5513