G05F

SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES[4,5]

Note(s) This subclass covers:[4] systems only;use of hydraulic, pneumatic, mechanical, and electrical motors for varying electric characteristics of devices which restore the quantity regulated;the combination of static converters and current or voltage regulators, if the essential characteristic resides in the combination  This subclass does not cover elements per se, which are covered by the relevant subclasses