مخترع سماعات الأذنين

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30 ديسمبر 2013

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مخترع سماعات الأذنين

الأمريكي تشيستر جرينوود، وكان ذلك في عمر الـ15 قبل أن يضيف 100 براءة اختراع أخرى في حياته.

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