Scientific, electrical, measuring, signalling and checking apparatus and instruments, calculators, television sets, computers, computer programs, word processors comprising keyboards, video display screens, print out apparatus, tape recorders and drives therefor for use with computers; printed circuit boards, cables plugs sockets and switches all being electric; magnetic tapes and electronic memory units all for computers; power supply units comprising transformers and rectifiers; parts and fittings included in Class 9 and for all the aforesaid; but not including optical or photographic apparatus or instruments