Air quality measurement apparatus, namely, particle counters; Anemometers; Calculating machines; Chronographs for use as specialized time recording apparatuses; Clothing for protection against chemicals and radiation; Electronic navigational and positioning apparatus and instruments; Electronic notice boards; Ergometers not for medical purposes; Garments and clothes for protection against fire; Geiger counters; Hydrometers; Industrial X-ray apparatus in the nature of testing equipment for det...