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But the most significant invention of the company, which is a bit its distinguishing feature,  is the revolutionary [[accordion filler]] a peculiar variant of breather tube filler which allowed a large ink capacity, in which the pumping was carried out thanks to an ink sac with accordion walls, and in which the bulb was replaced by a button under the bottom, consisting of a glass ampule inserted to slide in the rear end of the body, that you could press to make the pumping, use and also to see the remaining ink.

But the most significant invention of the company, which is its distinguishing feature,  is the revolutionary [[accordion filler]], patented in 1938 ({{Cite patent|FR|854177}}). It's a peculiar variant of a breather tube filler allowing a very large ink capacity, in which the pumping was carried out thanks to an ink sac with accordion walls, and in which the bulb was replaced by a button consisting of a glass ampule inserted to slide in the rear end of the body, that you could press to make the pumping, and also use to see the remaining ink.