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. | 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. |