Software, downloadable computer software, application software, computer software platforms, software, including application software for use with mobile devices and computers; software, including application software for use in the field of gas; software, including educational and training software applications in the field of gas, gas apparatus and equipment; calculating, measuring and weighing software and apparatus; software, apparatus and instruments for measuring, calculating, weighing and checking of gas, gas mixtures, gas related apparatus, fittings and equipment; computer software related to gas volume, gas vaporisation, gas conversion, gas related apparatus, gas fittings, equipment and products, gas bottle and other container sizing, gas pipe sizing, selection of gas, gas apparatus and equipment, gas tools, gas safety and gas safety legislation, regulation and standards, gas handling, gas storage and gas cylinder placement; software including application software for use by gas fitters, plumbers, educators and students; computer software, including computer application software related to the selection, ordering, management, procurement, supply, wholesale, retail, delivery and promotion of gas, gas mixtures, gas related apparatus, fittings and equipment; publications downloaded in electronic form from the Internet; downloadable electronic publications, including publications in the field of gas, gas apparatus and equipment, gas measurement, gas handling, gas storage and safety and gas safety standards; teaching apparatus and instruments; data processing equipment, magnetic data carriers, recording discs; compact discs, digital recording media