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10 jun 1752 año - Invention of Bifocals

Descripción:

In 1752, Benjamin Franklin invented bifocals. Bifocals are glasses with transitional lenses that allow people who are both farsighted and nearsighted to maintain their vision with one pair of glasses, and while they have been upgraded, they are still used today.

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The American Journey

BySam Dorfman
16 oct 2018
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fecha:

10 jun 1752 año
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~ 273 years ago

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