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Image of BIFOCALS, 1760s. - Benjamin Franklin's Sketch For Bifocal Eyeglasses, Which He Is Credited With Inventing. From Granger - Historical Picture Archive
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Invention Of Bifocal Lenses By Benjamin Franklin | Invention By Founding Father Of America - YouTube
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Cache of Benjamin Franklin's Original Manuscripts—Doodles and All—Gets Digitized | Smart News| Smithsonian Magazine
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