Electrical apparatus and instruments, including measuring, recording and automatic controlling apparatus and instruments, sound recording apparatus, transmitters and receivers and calculating machines, including computers

Electrical insturments such as laboratory standard instruments portable and panel insturments; recording instruments; voltmeters, ammeters, frequency meters, wattmeters, power factor meters; cycle counters, three phase ground detectors, synchroscopes; electrostatic voltmeters, instrument-transformers, phono-meters, precision measuring apparatus such as DC & AC galvanometers, bridges and potentiometers, circuit testers, earth resistance testers, insulation testers, line testers, pulse testers, vacuum tube testers, vacuum tube voltmeters, Q-meters, C-meters, level meters, oscillographs and power axcillagraphs flux meters, escillators, amplifiers, attenuators, all electronic AC network analyzer, and industrial instruments such as electronic instruments (indicators recorders and controllers) for measurement and control of temperature, flow, liquid level, ph, gas Analysis, solution conductivity, illumination, humidity, dew-point viscosity, polarographs