Improvements in the manufacture of recreational vessels. (Machine-translation by Google Translate, not legally binding)

摘要

Improvements in the manufacture of recreational boats, characterized by equipping the boat with a hollow keel made and arranged so that it can be filled with any ballast material to ensure the stability of the boat during navigation, and emptied to lighten its weight and thereby facilitate the transport of the vessel itself. (Machine-translation by Google Translate, not legally binding)