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why there's hole in Pen's cap?
Anonymous:
The hole on the barrel creates the same level of air pressure inside and outside of the pen, allowing the ink to flow into the point. This is called a “venting system.”
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The pen caps have holes in them to prevent suffocation, in case they were swallowed. One of the oldest and more popular ballpoints were the Bic Cristal who originally made it part of their design to include a small hole at the end of the cap.
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to prevent suffocation in case they have been swallowed.
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