Air tanks for use in scuba diving; Apparatus for recording, transmission, processing and reproduction of sound, images or data; Apparatus for transmission of communication; Audio speakers; Breathing apparatus for divers, namely, rebreathers; Buoyancy compensator jacket for use in scuba diving; Digital voice signal processors; Dive computers for underwater use; Electronic navigational and positioning apparatus and instruments; Loudspeakers with built in amplifiers; Microphones for communicatio...