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...along with all that is necessary for the compression system. Moreover, the sacs tend to deteriorate, breaking or losing their elasticity, and must be repla

...was simple, functional and robust, and allowed [[Chilton]] pens to use ink sacs with significantly larger dimensions than those of competitors, so that the

...rest position, provide access to the pressure bars that allow to wring the sacs placed internally of both pens, that contain the ink. In this case it is no

...; this is typically due to the release of sulphurous gases from the rubber sacs. Furthermore, the celluloid is extremely flammable, and is not the case to