DATA PROCESSORS AND COMPUTERS; DEVICES FOR DIGITAL AND ANALOG SIGNAL PROCESSING, NAMELY, MICROPROCESSORS, INTEGRATED CIRCUITS, PRINTED CIRCUIT BOARDS, MEMORY CARDS,TRANSISTOR CIRCUITS, SIGNAL AMPLIFIERS, SIGNAL FILTERS,SIGNAL CONDITIONERS, SIGNAL DELAY CIRCUITS; BLANK MAGNETIC DATA CARRIERS; PRERECORDED AUDIO TAPES; VIDEO TAPES, CD-ROMs, MAGNETIC DISKETTES, PLASTIC CARDS WITH MAGNETIC STRIPE, MAGNETIC DISKETTES, MAGNETIC TAPES FEATURING PLAYS AND GAMES, EDUCATIONAL INSTRUCTIONS FOR NATURAL SC...