Covers general prerequisites for wire-wound precision, variable resistors. Gives essentials for precision resistors type RR0900, wire-wound, variable. Gives essentials for precision resistors type RR1100, wire-wound variable. Outlines essentials for precision resistors type RR2000, wire-wound variable. Outlines essentials for precision resistors type RR3000, wire-wound variable. Outlines essentials for precision resistors type RR1000, wire-wound variable.