Automatic board for graphic planning (Machine-translation by Google Translate, not legally binding)

摘要

An automatic board for planning charts, which is characterized by being a flat surface of variable measures in which there is a central space profusely drilled by holes arranged in horizontal rows and other verticals that coordinate with the previous ones, apt to receive in them the insertion of pins carrying the end of an elastic thread passing to the back of the board through the first hole of each row, is linked in a metal spring of appropriate nature, which in turn is retained in the rear edge of the board. (Machine-translation by Google Translate, not legally binding)