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Nippon Sheet Glass, a large Japanese manufacturer, has increased its holding in Pilkington, the UK glass group, from 10 to 21 per cent over the past fortnight, but has ruled out mounting a full bid.

At Vitrum 2001 Optical Surface Technologies (OST) will present both well-known brands the Regipol and Tecepol. These brands have been in existence for nearly 40 years and are produced at OST's factory in the north of England.