Harmonized System

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Section XVIII > Chapter 90 > Heading 9005

Explanatory notes

… refracting telescopes . Unlike reflecting telescopes which have a mirror for objective, refracting telescopes … of light.        The heading includes refracting telescopes whether designed for visual, visual and photographic, or solely for photographic observation. When equipped with a photographic camera which forms an …

Section VI > Chapter 28 > Heading 2844

Explanatory notes

… will be of different mass (different mass number). Nuclides which differ only in the mass number and not in the atomic … Because of this, different isotopes of an element whose nuclei have the same electrical charge but different … chlorine 37 (which gives it its atomic weight of 35.457). When an element is composed of a mixture of isotopes, its …

Section XVI > Chapter 84 > Heading 8486

Explanatory notes

… of extremely pure monocrystalline semiconductor boules from which wafers can be sliced. (3)   Crystal grinders , which grind the crystal boule to precise diameter required … ) or, in some instances, X-rays : (a) Contact printers , where the mask or reticle is in contact with the wafer …

Section XVIII > Chapter 90 > Heading 9025

Explanatory notes

… of these instruments are known according to the use for which they are designed, for example, alcoholometers; … In one type the lower end stands in a cistern of mercury, while in another type the lower end of the tube is bent into … of one or more hairs or strips of plastics, according to whether they are dry or humid. The hairs or strips of …

Section VI > Chapter 29 > Heading 2937

Explanatory notes

… - Other This heading includes : (I)    Natural hormones, which are active substances produced in the living tissues … six- or seven-member ring or reducing to a five-member ring while maintaining the relative gonane ring structure … as their storage as glycogen and fat. Pure insulin is a white, non-hygroscopic amorphous powder or shiny crystals, …

Section XVIII > Chapter 90 > Heading 9030

Explanatory notes

… contained in the ionisation chamber. The ions formed when a radiation enters the chamber are attracted to the … ionise the gas contained in the tube. This sets up impulses which may be counted. The ionisation chamber and Geiger …

Section XI > Chapter 58 > Heading 5804

Explanatory notes

… fabrics consist of warp threads with weft threads which twist round each warp thread and run diagonally from … of tulle or net, or by sewn appliqué work on a ground, whether or not the ground is subsequently wholly or partly removed. Such products are classified as …

Section VI > Chapter 28 > Heading 2836

Explanatory notes

… metal salts of the non‑isolated carbonic acid (H 2 CO 3 ), whose anhydride (CO 2 ) falls in heading 28.11. (II)  …        These processes give commercial ammonium carbonate which, in addition to various impurities (chlorides, … ammonium carbonate (included in this heading) occurs in white crystalline masses or in powder, soluble in hot water. …

Section XVII > Chapter 87 > Heading 8704

Explanatory notes

… devices (tipping lorries (trucks), etc.); tankers (whether or not fitted with pumps); refrigerated or insulated … etc., devices. The heading also covers lightweight three‑wheeled vehicles, such as : -      those fitted with motorcycle engine and wheels, etc. which, by virtue of their mechanical structure, …

Section VI > Chapter 29 > Heading 2933

Explanatory notes

… - Compounds containing an unfused pyrazole ring (whether or not hydrogenated) in the structure : 2933.11 - - … - Compounds containing an unfused imidazole ring (whether or not hydrogenated) in the structure : 2933.21 - - … of glycollic acid with urea. (2) Lysidine . Hygroscopic white crystals; used in medicine as a solvent for uric acid. …

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