... control system, an overload indicatingand overvoltage & under-voltage protective circuit so as to prevent the tube head ... the Cantilever, Handspike, Deedbox, Break Touching Plate, Pedal, Voltage Meter, Power Indicator, Warning Indicator, Power Adjustment Knob, mA ... Selection Switch, Output Switch, High Voltage Selection Knob, Maximum Ratings Table, Ammeter, Time Selection ...