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...the tank to the nib that deposits it on the sheet of paper, and a fountain pen writes well because its feeder does its job correctly. ...at the end of the 1800s, manufacturers were competing (and investing their research efforts) on this very element, which characterized their pens (think, for e

...August 31 , 1933 and the French patent {{Cite patent|FR|728038}}.<ref> in patents are cited as inventors Chelazzi Mirko and Dino Frulli, presumably Zerollo e ...iding in opposite directions by means of grooves made ​​in the body of the pen, and brought alternately inside and outside the body according to the direc