Electro-optical couplers; Electro-optical devices; Electro-optical glass for magnetic discs; Electro-optical instruments; Electro-optical sensors; Electronic files for the storage and retrieval of data on optical discs; Encoded optical discs; Fibre optical elements; Fibre optical sensors; Optical amplifiers; Optical apparatus and instruments; Optical apparatus for displaying photographic transparencies; Optical apparatus for measurement; Optical apparatus for measuring the gloss of materials; Optical apparatus for measuring turbidity of liquid materials; Optical apparatus for portable radio stations; Optical apparatus for scanning; Optical apparatus for the processing of data; Optical apparatus for the reception of data; Optical apparatus for verifying; Optical apparatus in the form of prisms; Optical communication apparatus; Optical communication systems; Optical communications installations; Optical communications instruments; Optical component holders; Optical components for use in laboratory research; Optical components, other than for medical use; Optical electronic components; Optical electronic label reader installations; Optical electronic label reader installations for industrial use; Optical emitters; Optical encoders; Optical energy transfer apparatus; Optical fibers (fibres) (light conducting filaments); Optical fibre apparatus, other than for medical use; Optical fibre cables; Optical fibre telecommunications apparatus; Optical fibres for industrial applications; Optical filters capable of controlling transmission rate of signals; Optical filters for use with cathode ray tubes; Optical filters for use with visual display units; Optical goods for personal use; Optical headlamp adjustment apparatus; Optical hydrogels being contact lens blanks; Optical imaging, other than for medical use; Optical information reading apparatus; Optical inspection apparatus for pattern recognition; Optical instruments, other than for medical use; Optical laser disc storage materials; Optical lenses; Optical lenses for use with spectacles; Optical lenses for use with sunglasses; Optical materials for recording data; Optical materials for storing data; Optical measurement apparatus; Optical measuring components; Optical measuring devices; Optical memories; Optical microscopes for biological purposes; Optical microscopes for industrial purposes; Optical microscopes for scientific purposes; Optical microscopes for the testing of materials; Optical networks; Optical plug connectors; Optical power transmission apparatus; Optical processing apparatus; Optical products, other than for medical use; Optical projection apparatus; Optical receivers; Optical recording media; Optical sensors; Optical signalling apparatus; Optical sources, other than for medical use; Optical storage apparatus; Optical switches; Optical temperature measuring instruments, other than for medical use; Optical transducers for use with electrical apparatus; Optical transmitters; Optical transmitters for use with fibre optic cables; Optical viewing screens; Optical waveguides; Plastic optical fibres; Pouches for optical apparatus; Pre-recorded optical tapes; Printed publications in optically recorded form; Programs recorded on optical data carriers; Pulse code modulation apparatus for transmission via optical fibres; Pulse code modulation instruments for transmission via optical fibres; Sensors incorporating optical fibres; Sheaths for optical fibre cable; Sheaths for optical wires; Signal transmitting apparatus utilising optical fibres; Sources of optical beams for communications