COMPUTERS; COMPUTER PROGRAMMES; MEMORIES FOR USE WITH COMPUTERS; ELECTRONIC INSTRUMENTS AND APPARATUS ALL FOR THE STORAGE AND RETRIEVAL OF DATA; DISCS, TAPES, WIRES AND CASSETTES, ALL BEING MAGNETIC, FOR USE WITH COMPUTERS; INTERGRATED ELECTRIC CIRCUITS ALL FOR THE STORAGE OF ANALOGUE OR DIGITAL DATA FOR RETRIEVAL BY OPTICAL, MECHANICAL ELECTRICAL OR BY MAGNETIC MEANS