How a Retractable Ballpoint Pen Works

Name: How a Retractable Ballpoint Pen Works
Uploaded: 2015-09-23T03:01:40+00:00
Description: A ballpoint pen seems simple: press a button you can write, press again and put it in your pocket. Yet inside a clever mechanisms turns that simple...

Collected by YouTube on Sep 23, 2015

A ballpoint pen seems simple: press a button you can write, press again and put it in your pocket. Yet inside a clever mechanisms turns that simple...

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