… to fix bull‑head rails to the sleepers; they are secured by coach screws or bolts. Chair wedges are used to hold … the sleepers and are fixed to them by cramps, bolts, coach screws, spikes or, in the case of steel, by welding. …
… weft threads which alternately pass under the warp and then float on the surface over two or more warp threads. After weaving, the portions floating on the surface are cut, the cut ends standing up to … warp threads. Weft pile fabrics which have not yet had the floats cut, at which stage they have no pile standing up, …
… (C 6 H 5 OH). Obtained by fractional distillation of coal tars or by synthesis. White crystals, with a … derived from toluene are found in varying proportions in coal tar oil. o -Cresol is a white crystalline powder … of xylene. Six isomers are known; they are obtained from coal tar oils. To fall in this heading, single or …
… electrical and electronic assemblies and printed circuit boards : 8549.31 - - Containing primary cells, primary … electrical or electronic parts, including printed circuit boards. As goods of this heading are not intended to be …
… or for biological or medical purposes (in conjunction with radioactive tracers). They include : (1) Detection … tubes (boron, boron trifluoride or hydrogen types, or using radioactive fissionable elements). (4) Radiation measuring … Measuring or checking apparatus designed to incorporate a radioactive source (in particular, artificial isotopes), for …
