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This is the original version (as it was originally made).
11. Black Diamond Gem briquettes, manufactured by Coal Products Limited at Immingham Briquetting Works, Immingham, North East Lincolnshire, which—
(a)comprise anthracite duff (as to approximately 20 to 30% of the total weight), petroleum coke (as to approximately 40 to 45% of the total weight), bituminous coal (as to approximately 12 to 22% of the total weight) and molasses and phosphoric acid binder (as to the remaining weight);
(b)were manufactured from those constituents by a process involving roll-pressing and heat treatment at about 300°C;
(c)are pillow-shaped briquettes marked with two parallel indented lines running latitudinally around the briquette;
(d)have an average weight of 160 grams; and
(e)have a sulphur content not exceeding 1.5% of the total weight.
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