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Bifocals - The Amazing Adventures of Ben Franklin - TIME
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Benjamin Franklin Invented Bifocals - Fact or Myth?
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Ben Franklin Glasses - Ben Franklin Spectacles | Benjamin Franklin
Benjamin Franklin, Yes That One, Developed The Bifocal Lenses - South Florida Reporter
Benjamin Franklin and the Invention of Split Bifocal Lenses
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Benjamin Franklin Invented Bifocals - Fact or Myth?
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