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6N.I.Use for any of the following processes so far as not included in paragraph 5 and except a process ancillary to the getting, dressing or treatment of minerals, carried on in or adjacent to a quarry or mine:—
(a)burning of building bricks;
(b)lime or dolomite burning;
(c)production of calcium carbide;
(d)foaming, crushing or screening of stone or slag.