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Bifocals and Trifocals for Vision After Age 40
Benjamin Franklin (Bifocals) timeline | Timetoast timelines
Cache of Benjamin Franklin's Original Manuscripts—Doodles and All—Gets Digitized | Smart News| Smithsonian Magazine
BIFOCALS, 1760s. Benjamin Franklins sketch for bifocal #12233760
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Numbers in the News: Benjamin Franklin Science Article for Students | Scholastic Science World Magazine
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Hard a port(al)
Benjamin Franklin - Independence National Historical Park (U.S. National Park Service)
Bifocals - The Amazing Adventures of Ben Franklin - TIME
Image of BIFOCALS, 1760s. - Benjamin Franklin's Sketch For Bifocal Eyeglasses, Which He Is Credited With Inventing. From Granger - Historical Picture Archive
WION - #TodayInHistory | 1785: Benjamin Franklin announces invention of bifocal glasses | Facebook
Benjamin Franklin and the American Enlightenment - Bill of Rights Institute
Ben Franklin's inventions: bifocals
Ben Franklin Glasses - Ben Franklin Spectacles | Benjamin Franklin
