A perfected cantonera for fixing suspended overlapped leaves. (Machine-translation by Google Translate, not legally binding)

摘要

Armor of fastening superimposed sheets for calendars and the like characterized by being of u-section of branches curved in the same direction so that between the inner concave face of one branch and the inner convex gives the other branch of the u the leaves are fastened superimposed. (Machine-translation by Google Translate, not legally binding)