Telecommunication systems.
D003365:Costs and Cost Analysis; D006801:Humans; D007391:International Cooperation; D008853:Microscopy / Q000295:instrumentation; D008872:Microwaves; D013508:Ophthalmologic Surgical Procedures; D009885:Ophthalmology / Q000193:education / Q000295:instrumentation; D013685:Telecommunications / Q000295:instrumentation*; D013689:Telephone; D013690:Television; D006113:United Kingdom