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7 янв 1000 г. - Reading Stone

Описание:

The first vision aid, called a reading stone, is invented. It is a glass sphere placed on top of text, which it magnifies to aid readability.

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History of microscopes - Lily coulton

ByLily Coulton
5 мая 2023
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7 янв 1000 г.
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~ 1026 г назад
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