Lightning arresters; lightning conductors; bio-polar lightning arresters; fuses for electric current; conventional air terminals; surge protectors; electromagnetic pulse surge protectors; electric circuit switches; electricity limiters; electric resistors; rheostats; earth bars; earth switches; earth conductors; electronic components in the nature of filters; electric cables and wires; noise filters; earth busbars; electro-magnetic pulse filters; electro-magnetic pulse protector devices; elec...