Sound or audio data transmitting apparatus and devices, namely, telecommunication machines, apparatus and their parts and electronic machines, apparatus and their parts, all for transmitting sound and audio data; speaker systems primarily consisting of audio speakers; loudspeakers; microphones; amplifiers; stereo receivers; radio tuners; tape recorders; head-phones; pick-ups; audio mixers; echo units, namely echo sounders; audio equalizers; digital and analog time delay units as sound equipme...