Title in the catalog: (de) Acht Draht-Modelle über die Abhängigkeit der Rückkehrelemente der Projectionen einer unebenen Curve von denen der Curve selbst
Models show the relationship between all possible singularties of space curves (at the origin $O$) and singularities of their 3 corresponding projections on the coordinate planes $xOy$, $xOz$, and $yOz$ at the image of $O$.
