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Tip mechanism for knock-type ballpoint pen - Patent 1055523
Custom ballpoint pen with a unique click to open mechanism
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Mechanism Library: Multicolor Pen
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Ballpoint pen - Wikipedia
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Lazlo, the ballpoint pen with a neodymium magnet mechanism – Makers Cabinet
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Retractable pen mechanism - YouTube
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How a Retractable Ballpoint Pen Works - YouTube
What is the mechanism behind the working of a ballpoint pen? - Quora
How does a retractable ballpoint click pen work? | The Kid Should See This
