Perfected structure for rules and similar instruments. (Machine-translation by Google Translate, not legally binding)

摘要

Improved structure for rules and similar instruments, characterized essentially by the fact of comprising a central support and handle and two transparent side pieces fitted in grooves made in the edges of the same, whose parts have an upper inclined plane and a lower plane located at a level slightly higher than the surface of the base of the instrument. (Machine-translation by Google Translate, not legally binding)