CPC Subgroup
H03F 9/04 voltage-controlled, i.e. the load current flowing in only one direction through a main coil, e.g. Logan circuits (H03F9/06 takes precedence)
Full Title
Magnetic amplifiers > voltage-controlled, i.e. the load current flowing in only one direction through a main coil, e.g. Logan circuits (H03F9/06 takes precedence)