A defense for boats of any kind and openwork of spherical shape, characterized by being equipped with a mechanism that allows its movement backwards or forwards that is the same of the ship and that consists of a spring disposed internally in its central upper part and in vertical sense, with a hook in its lower part from which pulls a cable that reaches the opposite end, sufficiently taut, in order to maintain its spherical shape since the action of the spring could make it disappear. (Machine-translation by Google Translate, not legally binding)
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