Acoustic couplers; air analysis apparatus; alarms; amplifiers, amplifying tubes and amplifying valves; amusement apparatus adapted for use with television receivers; automatic and coin operated amusement machines; anti-electrical-interference devices; electric devices for attracting and killing insects; electric batteries and boxes, chargers and acidimeters therefor; luminous beacons and blinking signalling lights; electric bells and buzzers; magnetic encoded cards; cathodes; cathodic anti-corrosion apparatus; computers; computer hardware including central processing units, integrated circuit chips, microprocessors, modems, screens, printers, data readers including barcode and optical character readers, computer peripheral devices, computer memories, mice and keyboards; computer software; impedance coils; circuit breakers; electric capacitors; electrical resistors and rheostats; electromagnetic coils, electric coils, electric collectors, mechanisms for coin-operated apparatus; compact discs; comparators; optical condensers; electric conductors, couplings, relays, switches and switch boxes and connectors, electrical control panels, electric converters, electrical distribution boards, electric cables, insulated copper wire; counterfeit coin detectors; counters; acoustic couplers; current rectifiers; magnetic and optical data media; data processing apparatus; demagnetising apparatus for magnetic tapes; detectors; digital plotters; light dimmers; electric discharge tubes other than for lighting; distance recording apparatus; automatic distribution machines; divers' apparatus; electric door openers and closers; electric welding apparatus; electro-dynamic apparatus for the remote control of signals; magnetic encoders; light meters; facsimile machines; fluorescent screens; frequency meters; fuses and fuse wires; galvanic cells and batteries; apparatus for games adapted for use with television receivers; gas testing instruments; gasoline gauges; electrically heated hair-curlers; heat regulating apparatus; high frequency apparatus; hygrometers; magnetic identity cards; electricity indicators; water level indicators; electrical inductors; intercommunication apparatus; interfaces for computers; electricity inverters; ionisation apparatus (not for the treatment of air); jukeboxes for music and for computers; electricity junction boxes; odometers for vehicles; lasers not for medical purposes; apparatus for measuring the thickness of leather; electric light dimmers; lightning arresters; electric locks; magnetic data media including tapes, magnetic encoders; magnets; masts for wireless aerials; material testing instruments and machines; measuring instruments and apparatus; electric measuring devices; meteorological instruments; meters, microphones; electric monitoring apparatus; observation instruments; ohmmeters; optical data media; optical fibres; oscillographs; electronic pens for visual display units; plugs, sockets and other electrical connections; precision balances; precision measuring apparatus; pressure measuring apparatus; probes for scientific purposes; protection devices against x-rays (not for medical purposes), pyrometers; radar apparatus; radios; audio and video receivers; telephone receivers; apparatus for recording distance including vehicle odometers; electric regulating apparatus including light dimmers; remote control apparatus; electrical apparatus for sealing plastics; self-regulating fuel pumps; signal bells; signalling panels (luminous or mechanical); electric soldering apparatus; sound alarms; sound recording reproduction and transmitting apparatus including recording carriers, recording discs, recording strips, loudspeakers and cabinets therefor, tape recorders, styli for record players; cleaning apparatus for sound recording discs; tachometers; magnetic tape units for computers; demagnetising apparatus for magnetic tapes; telephone apparatus including receivers, transmitters and wires; electricity transformers; electronic transistors; transparency projection apparatus; electric discharge tubes (other than for lighting); automatic turnstiles; video tapes and video recorders; voltage regulators for vehicles; voltmeters; electric welding apparatus including welding electrodes; word processors; protection devices against x-rays (not for medical purposes); x-ray producing apparatus and installations, including x-ray tubes (not for medical purposes)

Professional consultancies (not business consultancies) including consultancies in design and operation of electrical, electronic and computer hardware and control systems; research and development (for others); scientific and industrial research