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8N.I.Use for any of the following purposes, so far as not included in paragraph 5:—
the distilling, refining or blending of oils;
the production or employment of cellulose lacquers (except their employment in garages in connection with minor repairs), hot pitch or bitumen;
the stoving of enamelled ware;
the manufacture of paint and varnish (excluding mixing, milling and grinding);
the production of rubber from scrap; or
the manufacture of acetylene from calcium carbide, for sale or for use in a further chemical process.