… machines carry out operations similar to those mentioned in paragraph (I) above in connection with stone or the like. … material by removal of material, by laser or other light or photon beam, ultrasonic or plasma arc processes and other … covers the sawing or cutting machines described in paragraph (A) of Part (I) of the Explanatory Note to heading …
… cupreous iron pyrites. Pyrites are mainly composed of iron sulphide; they are grey or yellowish, with a metallic lustre … Unroasted pyrites are mainly used for the extraction of sulphur, although certain cupreous pyrites may also serve … It also excludes : (a) Chalcopyrite (mixed copper‑iron sulphides) ( heading 26.03 ). (b) Marcasite (semi‑precious …
… per gram), and by the presence of van der Waal’s bonds (physical adsorption) or free chemical bonds saturable by … filter media chiefly used in the preparation of chemical or pharmaceutical products (especially antibiotics), in sugar …
… silicon and selenium) doped with, for example, boron or phosphorus, generally in a proportion of the order of one … 28 . (2) Chemical compounds such as cadmium selenide and sulphide, indium arsenide, etc., containing certain …
… This is obtained by the fusion of roasted copper sulphide ores to separate the copper sulphide from the gangue and the other metals which form a … matte. The matte consists essentially of copper and iron sulphides and is generally in the form of black or brown …
