Computers, computer peripheral devices; data processing machines; instructional and teaching apparatus; modems; acoustic couplers; disc drives; CD read only memory drives; electric and electronic printing and plotting machines; bar code readers; visual display units; keyboards and key pads for data entry; computer memory devices; computer interface devices; computer data input devices; parts and fittings for all the aforesaid goods; magnetic tapes, discs, cards and wires; data carriers bearing or incorporating machine readable data; optical discs; computer programs; holograms; all relating to the works of M. C. Escher; all included in Class 9.;