Turtle Pens With ‘Turtle Head’ Technology

The Turtle Pen is worth a mention for its nib-retraction mechanism, dubbed the “Turtle Head”. And yes, that’s exactly what you think it is: the business end of the pen squeezes itself out through the tight sphincter that is the end of the pen’s barrel.
Instead of pressing a button on the top of the pen, [...]

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Source: http://www.wired.com/gadgetlab/2011/05/turtle-pens-with-turtle-head-technology/