product research and development and design of audio and visual electronic equipment with interactive capabilities, namely stereo amplifiers, radio receiving tuners, equalizers, loudspeakers, compact discs and cassette players, televisions, video tape recorders, video disc players, telephone equipment, comprising of dialers, intercoms, receivers, transmitters and caller identification boxes, answering equipment and video-conferencing equipment, computers and computer peripheral equipment and supplies, comprising of computer monitors, computer printers, computer keyboards, graphics tablet, remote control units for operating audio and visual electronic equipment, CD-ROMs, blank computer floppy disks, computer programs for operating audio and visual electronic equipment for use in entertainment, education, information and communication, and instruction manuals sold together as a unit