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Benjamin FRANKLIN (6 January 1706 - 17 April 1790) - 1784 - The bifocal lens is invented (Benjamin Franklin, United States)... | GREENERPASTURE , United States (USA) (American Colonies) - 1784 - The Bifocal Lens Is Invented (Benjamin Franklin, United ...
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These are bifocals. Another seeing aid. They are having TWO foci. Having TWO portions, one for near an… | Ben franklin inventions, Inventions, Woman reading glasses
Benjamin Franklin Invented Bifocals - Fact or Myth?
