electric discharge devices / Hall effect devices / voltage direct-current power transmission systems / breakdown devices / transmission systems / a.c. networks / individual converting devices / non-breakdown devices / electro-chemical type / a.c.-d.c.-a.c. systems / semi-conductor devices / protective systems / h.v.d.c. power transmission systems / semiconductor devices / above applications / temperature responsive devices / arrangements using semi-conductor devices / radiation-sensitive devices / voltage d.c. link systems / /
UKC Key, Section H: Electricity