37. Supabrite Coke Doubles, manufactured by H. J. Banks and Company Limited at Inkerman Road Depot, Tow Law, County Durham, which—
(a)comprise metallurgical coke (as to approximately 40 to 60 per cent of the total weight) and petroleum coke (as to the remaining weight);
(b)were manufactured from those constituents by a process involving blending and screening;
(c)are unmarked random shapes; and
(d)have a sulphur content not exceeding 1.95 per cent of the total weight.