Accelerometers; acoustic alarms; aerials; air analysis apparatus; altimeters; amplifiers; amplifying tubes; balancing apparatus; bullet-proof clothing; bullet-proof waistcoats; buzzers; cabinets for loudspeakers; calipers; capillary tubes; connectors [electricity]; contacts, electric; data processing apparatus; decompression chambers; distribution boxes; distribution consoles [electricity]; electronic pens; flowmeters; furnaces for laboratory use; heat regulating apparatus; high-frequency app...