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Portus S A
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Mechanical Pencils And Projecting And Retracting Systems Therefor, And Multi-System Writing Instruments
(AREA)
Abstract
Ballpoint pen, characterized essentially by the fact that the writer cartridge is attached at its inner end to a head guided inside the barrel with the possibility of axial but not angular sliding, the head of which has a helical cam driven by a protrusion of the inside of the cap of the ballpoint pen, which is mounted rotatable in relation to the barrel. (Machine-translation by Google Translate, not legally binding)