26 Electronic Test Instruments to Be Used by Electronic Engineers and Technicians in the Design, Production, Maintenance, and Calibration of All Types of Electronic and/or Electrical Apparatus and Circuits, Such as Radio, Television Receivers, Radar, Amplifiers, etc.-Namely, Signal Tracers; Vacuum Tube Voltmeters; Power and Bias Supplies; A.C. Bench Supplies; Battery Testers; Eliminators and Chargers; Deluxe Radio Frequency and Audio Signal Generators; High Frequency and Sweep Signal Generators; Conversion Kit for 5" Oscilloscope Consisting of Addition of Two Push-Pull Stages of Amplification Comprising an Oscilloscope, Tubes, Resistors and Condensers; Push-Pull Oscilloscopes; Multi-Testers; Tube Transistor and Circuit Testers; Multimeters; Resistance and Capacitance Substitution Boxes; Resistance-Capacitance Bridge and Resistance-Capacitance-Inductance Comparators; Resistance and Condenser Decade Boxes; Radio Frequency Probes