Two "Franklin Split Bifocal" lenses: (1) Oval, con
Two "Franklin Split Bifocal" lenses: (1) Oval, consisting of two half lenses of foci, 40" and 41" respectively; (2) Round, consisting of two half lenses of foci 40" and 9" respetively
- Object Number:
- United Kingdom Optical Co.
- Permanent collection
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