Single crystal silicon; polysilicon; integrated circuits; conductors, electric; control panels [electricity]; optical fibers [fibres] [light conducting filaments]; photovoltaic cells; solar batteries

Signals, luminous or mechanical; satellite navigational apparatus; lasers for industrial use; lasers for scientific use; optical lamps; silicon chips (electronic components); silicon wafer carriers for handling integrated circuits; selenium voltage surge protectors; optical fibers (fibres) (light conducting filaments); galvanic cells; solar batteries