28112910 --- Sulphur trioxide (sulphuric anhydride); diarsenic trioxide
84818081 ---- Ball and plug valves
84158100 -- Incorporating a refrigerating unit and a valve for reversal of the cooling/heat cycle (reversible heat pumps)
28046100 -- Containing by weight not less than 99,99?% of silicon
91131090 -- Of metal clad with precious metal
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