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Hard a port(al)
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Benjamin Franklin invented the bifocals eyeglasses in 1784… | Flickr
Invention of the Bi-focal | #TBT to the first pair of bifocals! Invented by Benjamin Franklin in 1784. Franklin wrote, to his friend George Whatley, that he was "happy in the...
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Twitter-এ AZ RETINA Project: "Benjamin Franklin was the first to invent # bifocals which helped people see both far and close distances all in one pair of spectacles. He accomplished this around 1784