… 69.05 - Roofing tiles, chimney-pots, cowls, chimney liners, architectural … of non-refractory goods, usually of common pottery but sometimes more or less vitrified, which, like bricks, are used in …
… Quaternary ammonium salts and hydroxides; lecithins and other phosphoaminolipids, whether …
Explanatory notes
… 29.23 - Quaternary ammonium salts and hydroxides; lecithins and other phosphoaminolipids, whether … ammonium hydroxide of general formula R 4 N + OH – corresponding to its inorganic parent ammonium hydroxide NH … (2) Lecithins and other phosphoaminolipids * . These are esters (phosphatides) resulting from the combination of …