There's a Reason For Holes on The Tops of Pen Caps, And It's Surprisingly Awesome
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You Know That Little Hole in Your Pen Cap? It Could Save Your Life
Bic Crystal Blue Pen cap on white background Stock Photo - Alamy
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Ever Wondered Why There Is A Tiny Hole At End Of A Pen Cap? It Is There For An Important Reason
Why There's a Hole in a Ballpoint Pen Lid | OfficeSuppliesBlog
Bic Crystal Blue Pen cap on white background Stock Photo - Alamy
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The Pencils of Pens #1: Bic Cristal. – PENCIL REVOLUTION!
You Know That Little Hole in Your Pen Cap? It Could Save Your Life
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This is the reason why there's a tiny hole in the top of your Bic pen lid - Mirror Online
Pen caps have holes because we filthy humans will gnaw on anything - CNET
If You See a Hole In a Pen Cap, This Is What It Means | Reader's Digest
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Why do Pens are given with holes in their Cap? - Quora
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