- Of silicon 2849.90.00 2850.00.00 Hydrides, nitrides, azides, silicides and borides, whether or not chemically defined, other thanpounds which are also carbides of heading 28.49. 28.52 Inorganic or organicpounds of mercury, whether or not chemically defined, excluding amalgams. 2852.10 - Chemically defined : 2852.10.10 - - Mercury ...
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