Scientific, nautical, surveying, photographic, cinematographic, optical, weighing, measuring, signalling, checking (supervision), life-saving and teaching apparatus and instruments; apparatus and instruments for conducting, switching, transforming, accumulating, regulating or controlling electricity; apparatus for recording, transmission or reproduction of sound or images; magnetic data carriers, recording discs; automatic vending machines and mechanisms for coin-operated apparatus; cash registers, calculating machines, data processing equipment and computers; fire-extinguishing apparatus; industrial instrumentation, control, positioning, data communication, positioning and presence sensing systems, including infrared photoelectric controls, safety light curtains, optical profiling scanners and data communication devices, spread spectrum radio frequency modems, infrared optical data links, microprocessor plug-in interfaces, parallel input-output cards, serial communication cards and multiplex transformers for system intercommunication, electronic and mechanical level and flow rate controls for use with pipes, conduits, weirs, channels, tanks, vessels and containers, photoelectric controls for position sensing, and electrical presence sensors for safety and security around industrial machinery and for automatic guided vehicles; parts and fittings for all the aforesaid goods.;