Security surveillance apparatus; Multipole connectors as matrix plugs (program heads) for data processing machines; Transmitter receivers; Wire free data transmission apparatus; Video monitor controllers; Video processors; Video switching apparatus; Video wall installations; Image processors; Audio and video receivers; Fibre optic receptors; Peripheral control devices for computers; Computer peripheral devices; Digital to analogue converters; Distribution amplifiers; Electronic apparatus for interfacing video apparatus; Decoders; Apparatus for controlling the operation of machines (computer); Matrix printers; Video devices