Information based filtering of audio for multimedia applications

A gun for sealing with sealing wax which includes a handgrip, a tank melting-pot for the sealing wax, a feeding device, an injector, and a punch. The gun is heated by heating elements. The tank melting-pot is connected with the feeding device and with the injector which consists of a chamber provided, in its terminal part, with a nozzle in which a plunger slides. The punch consists of a sliding rod provided, in its end, with a metallic engraved or raised mark.