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Marking up prescription glasses for bifocal and progressive lenses explained.
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Bifocals History
Ben Franklin invented bifocals and the lightning rod but patented none of his creations for public good. #history #didyouknow #BenjaminFranklin #Invention | Mystery Feed | Facebook
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Benjamin Franklin invented the lightning rod and bifocals but gave them away for free. #history #didyouknow #knowledgeispower #historyfacts | Antiqua
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