Harmonized System

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Section XVIII > Chapter 90 > Heading 9013

Explanatory notes

… ). This heading includes : (1)   Lasers . These produce or amplify electro‑magnetic radiation in the wavelength range … inside the lasing medium are repeatedly reflected and amplified in such a way that a coherent light beam (visible …       In addition to the lasing medium, the energy source (pumping system) and the resonant optical cavity (reflector …

Section XVIII > Chapter 90 > Heading 9030

Explanatory notes

… apparatus, specially designed for telecommunications (for example, cross‑talk meters, gain measuring instruments, … the resulting changes in the potential difference may be amplified and measured. (2)   Geiger counters . A large … source (in particular, artificial isotopes), for example, for measuring thickness of materials (sheets, …

Section VI > Chapter 28 > Heading 2805

Explanatory notes

… The five alkali metals are soft and rather light. They decompose cold water; they deteriorate in air, forming … It is kept in mineral oil or inert gases. Lithium helps to improve the qualities of metals, and is used in various … ordinary knife. It is preserved in mineral oil or in sealed ampoules. Potassium is used for the preparation of certain …

Section XI > Chapter 59 > Heading 5911

Explanatory notes

… technical purposes, including narrow fabrics made of velvet impregnated with rubber, for covering weaving spindles … of a kind used in paper‑making or similar machines (for example, for pulp or asbestos‑cement) : 5911.31 ‑ ‑ Weighing … FOR TECHNICAL USES, IN THE PIECE, CUT TO LENGTH OR SIMPLY CUT TO RECTANGULAR (INCLUDING SQUARE) SHAPE Provided …

Section VII > Chapter 39 > Heading 3909

Explanatory notes

… aldehydes (formaldehyde, furfuraldehyde, etc.). The most important are urea resins (for example, urea‑formaldehyde), thiourea resins (for example, … acids, alcohols, or other synthetic polymers) they are employed as glues and as textile dressings, etc. (See the …

Section VI > Chapter 34 > Heading 3402

Explanatory notes

… organic surface-active agents of this heading are chemical compounds, not chemically defined, which contain one or more … 0.5 % at 20 °C and left to stand for one hour at the same temperature, they give a transparent or translucent liquid … charged organic ions responsible for the surface activity. Examples are : sulphates and sulphonates of fats, vegetable …

Section XVI > Chapter 84 > Heading 8401

Explanatory notes

… contained inside the screen. A nuclear reactor generally comprises : (A)  The core , consisting of : (1) The fuel ( … capacity (e.g., boron, cadmium, hafnium) or of alloys or compounds of such materials. (B)   The mechanical structure (for example, the reactor vessel; the fuel element (cartridges) …

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