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; DE LUXE 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; MULTITESTERS, TUBE TESTERS; MULTIMETERS; ] RESISTANCE-CAPACITANCE BRIDGE AND RESISTANCE-CAPACITANCE-INDUCTANCE COMPARATORS; [ RESISTANCE DECADE BOX; AND RADIO FREQUENCY PROBES ]