NDT

chemical products supplied to the aerospace and engineering industries and not to the automotive and truck industries for use in tracing cracks, fissures, defects and stains in and on surfaces, all of which may be in the form of gasses, sprays, aerosol sprays, suspensions, emulsions, powders or solids

testing apparatus supplied to the aerospace and engineering industries and not to the automotive and truck industries, namely, eddy current defects meters, magnetic field strength meters, flux meters, yoke electromagnets, refractometers, UV lamps, UVA intensity monitors, magnetic flux indicators, magnetometers, magnetic reference test pieces, magnetic particle ink test (settlement) flasks, penetrant inspection test panels, electrostatic spray guns, probes, conductivity meters; electrical and electronic apparatus and instruments for use in connection with detecting fissures, flaws, cracks, defects and blemishes in and on metals