… and butane gases which are derived from petroleum oil and natural gas. To fall in this heading, these saturated … compounds, whether obtained by refining petroleum oils and natural gas or by synthesis (as regards the purity criterion …
… animal hair, or from mixtures of these fibres with other natural fibres (e.g., vegetable fibres, horsehair) or with … (1) by punching a sheet or web of textile staple fibres (natural or man‑made), without a textile fabric base, with …
… of precious metal or metal clad with precious metal, of natural or cultured pearls, of precious or semi-precious stones (natural, synthetic or reconstructed), even if such parts …
… liquid air, or also (in the case of helium) from certain natural gases. They are presented under pressure. Radon is a … . Arsenic (regulus of arsenic) is a solid extracted from natural arsenical pyrites. It exists in two main forms : …
