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Thermaglow briquettes manufactured by Volks Eigenes Betrieb Gaskombinat “Fritz Selbmann” at Lauchhammer, German Democratic Republic which —

(a)

are composed of milled lignite converted into briquettes by an extrusion process, after which they are dried and heated in the absence of air to about 1000°C;

(b)

are unmarked briquettes approximately 20 mm × 90 mm × 60 mm with rounded corners and a bulk density of 540 kilogrammes per cubic metre; and

(c)

have a sulphur content not exceeding 2 per cent of total weight.