sentences:  Aberli specialised in topographical scenery, particularly of the Swiss Alps and he also patented a technique using faint outline etching for the mass production of these views.Grimm supplied drawings which were used to illustrate Friedrich von Hagedorn's "Poetische Werke" which was published between 1769 and 1772.Grimm worked for Aberli until 1765, when at the age of 32, he moved to Paris to study under Johann Georg Wille who was a member of the Académie royal de peinture et de sculpture and "Graveur de Roi".