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A ballpoint pen. How does it work? In the tip of the pen there is a small metal sphere. One internal tube filled with a viscous ink is above the ball. -
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How does a Ballpoint Pen work? - Faber-Castell Grip X | Today we celebrate Ballpoint Pen Day! 🖊 Did you know that 1 gram of ink paste can write up to 10
Extreme closeup video shows how a ballpoint pen works, in all its gory detail
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