|Note_en=Confirmed by a letter reporting for some duration test showed in a page. From an [[Edacoto]] catalog for its mechanical pencils and its fountain pens, showing also some [[Aurora]] pens. Ninth page. Letter from endurance test (1931-09) and schema for the [[Aurora]] back lever filler for the [[Internazionale]] model. | |Note_en=Confirmed by a letter reporting for some duration test showed in a page. From an [[Edacoto]] catalog for its mechanical pencils and its fountain pens, showing also some [[Aurora]] pens. Ninth page. Letter from endurance test (1931-09) and schema for the [[Aurora]] back lever filler for the [[Internazionale]] model. |