… effected in the deposit itself by forcing superheated steam through pipes sunk in a bore hole (Frasch process). (3) … Note to heading 28.02 . The unrefined sulphurs in the last three paragraphs are sometimes fairly pure. This is … by the sudden cooling of sulphur vapours without passing through the liquid phase, which is insoluble, particularly …
… not exceeding 105 mm : 3702.31 - - For colour photography (polychrome) 3702.32 - - Other, with silver halide emulsion … and of a length exceeding 200 m, for colour photography (polychrome) 3702.42 - - Of a width exceeding 610 mm and of a … 610 mm - Other film, for colour photography (polychrome) : 3702.52 - - Of a width not exceeding 16 mm …
… treatment of oxides (of antimony, silver, arsenic, copper, chromium, cobalt, etc.) or salts (fluorides, phosphates, … The most widely used are gold, silver, aluminium or chromium lustres. (5) Glass frit and all other varieties …
… cuts in the back of the volume for receiving the cross threads. (6) Book‑sewing machines , including both simple … by means of metal or plastic spirals (or rings) passing through perforations in the pages . They normally consist of … usually of wood, with a screw device for holding the cross threads, used in the hand sewing of books ( heading 44.21 ). …
… with atmospheric air. The air and gas is in either case fed through concentric or converging tubes. (4) Combination … the coal is distributed over the fire-bed and moved forward through the furnace to secure even combustion. The most …
