21 CAPACITORS; COMPUTER COMPONENTS, CONNECTORS AND CASES; MEMORY CORES, FRAMES AND SYSTEMS; SWITCHES; DIODES; RELAYS; ELECTRIC MOTORS; TRANSFORMERS; AMPLIFIERS; INDICATORS; POWER SUPPLIES AND CONVERTERS
26 VOLTMETERS; OSCILLOSCOPES, FREQUENCY METERS; PHASE ANGLE, VOLTAGE, D.C., RESOLVER AND SYNCHRO STANDARDS; TAPE RECORDERS; POTENTIOMETERS; RATIO DIVIDERS; RECORDERS; TELEMETERS; ANALYSERS AND RESISTOR-DIVIDERS
THE MARK CONSISTS OF THE LETTER N IN DESIGN FORM. THE STIPPLING ON THE DRAWING IS FOR THE PURPOSES OF SHADING ONLY.