9 Apparatus and instruments for recording, transmitting, reproducing or processing sound, images or data; recorded and downloadable media, namely, pre-recorded USB drives, DVDs and CDs for use in printing or in connection with printing apparatus; recorded and downloadable computer software for use in printing or in connection with printing apparatus; blank digital or analogue recording and storage media; mechanisms for coin-operated apparatus; calculating devices, namely, calculators; computers and computer peripheral devices; recorded and downloadable computer software for use in operating 3D printing machines and associated equipment namely, printheads; computers and computer peripheral devices for use in operating 3D printing machines and associated materials and equipment namely, printheads; optical, weighing, measuring, signalling, detecting, testing and inspecting apparatus and instruments for 3D printing machines, namely, digital transmitters; component parts for printers, namely, unfilled ink supply components in the nature of cartridges, and containers for ink, for use with printers; computer hardware for use with print heads, namely, printers; computer interface components, namely, peripheral component interface hardware for printers; computer interfaces; recorded and downloadable computer software for controlling print quality; recorded and downloadable computer software for reporting ink temperature; recorded and downloadable computer software for reporting status of the print head in printing; recorded and downloadable computer software for use in adjusting print quality; recorded and downloadable computer software for use in printing or in connection with printers for printing; recorded and downloadable computer software for communicating with print heads; recorded and downloadable computer software to enable retrieval of data; computer-controlled document printers; downloadable computer software for remote monitoring and analysis of printers, inkjet printers, 3D printers and printing machines; electric changeover switches for printers; recorded and downloadable computer firmware for optimizing performance of print heads; ink controller unit, namely, unit for the stabilization of temperature of ink, for use with ink-jet document printers; ink jet document printers; ink management and supply systems for use with ink jet document printers comprised of ink pumps, cartridges and printheads, electronic printer control systems comprised of connection cables, printer interfaces, namely, computer network interface devices and electric changeover switches, print head cleaning appliances, namely, magnetic head cleaners, non contact head cleaners, vacuum head cleaners, contact head cleaners; ink-supply system for ink jet document printers comprised of ink pumps, cartridges and printheads; recorded and downloadable interactive computer software for use with printers for sending documents to printers; print head cleaning apparatus, namely, magnetic head cleaners; print heads for computer document printers; print heads for inkjet document printers; electronic storage device, namely, printer buffers; recorded and downloadable printer programmes for use in operating printers; printers, namely, document printers for industrial use; print heads for printers; recorded and downloadable software for use in operating and controlling print heads; recorded and downloadable computer server software for use with printers; recorded and downloadable computer software for scanning images and documents; recorded and downloadable software for controlling computer printers; digital colour printers for documents; downloadable electronic publications, namely, , books, leaflets and magazines in the field of printers and 3D printers; downloadable software applications for 3D printing for use with three dimensional printers; laser printers, namely, laser document printers, laser printers for printing tags and labels, and laser photo printers; laser colour printers for documents; mechanised coding apparatus, namely, encoding and decoding apparatus; recorded and downloadable software for access, distribution, management and retrieval of information stored on databases; recorded and downloadable software for creating, facilitating, and managing remote access to and communication with local area networks; recorded and downloadable software for database management in the field of printers and 3D printers; recorded and downloadable software for file and document management; recorded and downloadable software for image processing; recorded and downloadable software for managements and operation of printers and printer networks; recorded and downloadable software for network transmission and management of printers and printer networks; recorded and downloadable software for workflow management; thermal printers; replacement parts and fittings for the aforesaid goods