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36. HouseFuel Smokeless Ovals manufactured by Maxibrite Limited, Llantrisant, Rhondda Cynon Taf, South Wales, which—
(a)comprise anthracite fines (as to approximately 84 per cent of the total weight), petroleum coke (as to approximately 12 per cent of the total weight) and starch as binder (as to the remaining weight);
(b)were manufactured from those constituents by a process involving roll-pressing followed by heat treatment at a temperature of about 260°C;
(c)are unmarked pillow-shaped briquettes;
(d)have an average weight of 78 grammes per briquette; and
(e)have a sulphur content not exceeding 2 per cent of the total weight.