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Ancit 40 briquettes manufactured by Coal Products Ltd at Aberaman, Mid Glamorgan which —

(a)

comprise anthracite and coke breeze (as to approximately 75 per cent of total weight) and coking coal (as to the remaining weight);

(b)

after heat treatment of the constituents and conversion into briquettes by roll-press have been subjected to further heat treatment at about 400°C;

(c)

are unmarked cushion-shaped briquettes with an average weight of 40 grammes; and

(d)

have a sulphur content not exceeding 1.5 per cent of total weight.