Portable device to facilitate the teaching, and particularly, of the vocabulary of a foreign language (Machine-translation by Google Translate, not legally binding)

摘要

Portable device to facilitate teaching, particularly the vocabulary of a foreign language, characterized by the fact that it consists of a flat box comprising a lid and a bottom widened by its two opposite ends, movable around a hinge arranged in one of the widening and susceptible to be fixed together in the other widening by a spike to close the box. (Machine-translation by Google Translate, not legally binding)