Surveying machines and instruments; measuring signaling and checking apparatus and instruments for surveying, measuring and checking sound waves, sound and audio signals; apparatus and instruments for conducting, switching, transforming, accumulating, regulating or controlling electricity, namely, jacks, plugs, connectors and electrical conduits; apparatus for recording, transmission and reproduction of sound and images, namely, headphones, headsets, microphones, loudspeakers, audio earpieces, stereo sound reproducers, multimedia equipment, portable music players and telephones and mobile telephones; blank magnetic data carriers; prerecorded magnetic data carriers featuring sound and music files, motion picture films and data and software used for the instrument, signaling, checking, and manipulations of sound waves, sound and audio signals; blank recordable optical discs; calculators; data processors; computers; sound equipment, namely, amplifiers, graphic equalizers and sound cards for computers; software for recording, transmission and reproduction of sound for use in the production and reproduction of music, home and portable audio reproduction and scientific and industrial audio production and reproduction