Benjamin Franklin Glasses Invention - 搜索图片

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Benjamin Franklin Wearing Bifocals
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Benjamin Franklin’s Inventions | The Franklin Institute
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Benjamin Franklin announces his invention of bifocals | MAY 23 - Samoa Global News

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benjamin franklin invented glasses • Dumb Little Man
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Ben Franklin's inventions: bifocals
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Where would these come in if he never invented them? #benjami…
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These eye-opening facts a…
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5 Amazing Inventions by Benjamin Franklin
YouTube · The Lists · 11.8万次播放 · 2014年1月13日
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