How does it work? - Ballpoint pen

How does it work? - Ballpoint pen

The invention of the ballpoint pen made writing a lot easier.

Công nghệ

Từ khoá

bút bi, viết, dụng cụ viết, Thẩm phán László, bút chì, bút máy, lọ mực, hộp đạn, mực, Công nghệ

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Paper was invented more than two thousand years ago.

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Public schools in villages played an important role in education.

Than chì

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