Yttrium and its oxides. Method of determination of such impurities as oxides of praseodymium, neodymium, samarium, europium, terbium, dysprosium, holmium, erbium, thulium and ytterbium
Gas-fired central heating boilers. Type C boilers of nominal heat input exceeding 70 kW, but not exceeding 1000 Kw. Classification, requirements, test methods and marking
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