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Canon lanza-bollas which is characterized by being constituted by a cannon housed inside a cylindrical envelope with respect to which it is. It can move longitudinally by means of a lateral control, whose outer shell has fixed: in its upper part a tank to contain stored balls that constitute the projectiles, which can pass one by one to the inside of the barrel when moving it, through a port existing in said tank and in the enclosure, whose movable cation has its rear end edge confronted with those of a cylindrical chamber, provided with an internal limit stop for displacing the projectile in firing position whose chamber is sealed by a discoidal valve capable of displacement by a device housed in a back envelope allowing air to pass under pressure into the barrel to drive the projectile. (Machine-translation by Google Translate, not legally binding)