Puzzle based on seven geometric pieces from different sections of a rectangle. (Machine-translation by Google Translate, not legally binding)

摘要

A boot for liquids, with lining of plastic material, characterized in that it is provided with an inner body that constitutes a reservoir of plastic material, for example Plexiglas, made by placing two sheets of that material superimposed and joining them by pressure and heat through the line corresponding to the shape to be given to that lining that is then introduced into the boot. (Machine-translation by Google Translate, not legally binding)