Graduated rule of pocket. (Machine-translation by Google Translate, not legally binding)

摘要

Graduated pocket ruler, characterized by being formed by two thin sheets of plastic material or similar, which are articulated together by a rivet that allows its perfect overlap, as well as an opening that allows them to form a flat angle with in order to make a series of numbered divisions coincide until forming a double centimeter, with its corresponding subdivisions, that each one of the two aforementioned sheets is printed on the corresponding song, respectively. (Machine-translation by Google Translate, not legally binding)