Metering signalling and control devices and instruments, pressure measuring devices and pressure indicators, flow meters, level measuring devices, gas pressure regulators, valve control mechanisms being control devices electrically operated in response to the aforementioned sensing devices, and parts and fittings therefor included in Class 9

Furnaces involving the use of industrial gases and fluids in the metallurgical treatment of metals, in the sintering of non-metallic powders and in the heat treatment of semi-conductors, and parts and fittings therefor included in Class 11

Material treatment services including technical consultatio ns, supervision, inspection and testing involving the use of cryogenic gases and fluids in the metallurgical treatment of metals, in the sintering of non-metallic powders (eg. oxides) and in the heat treatment of semi-conductors

Gas supply and gas mixing apparatus for the supply of industrial gases and gas mixtures for use in the heat treatment of metals particularly in continuous furnaces for controlling the composition of atmospheres therein within desired limits