(19)

(11)

EP 0 329 654 A1

(12)

(43) Date of publication: 30.08.1989 Bulletin 1989/35 (21) Application number: 87905247.0 (22) Date of filing: 17.08.1987

(51) International Patent Classification (IPC):  E04D 1/ 26( . ) E04D 3/ 35( . ) E04D 1/ 28( . ) (86) International application number: PCT/GB1987/000576 (87) International publication number: WO 1988/001328 (25.02.1988 Gazette 1988/05)

(84) Designated Contracting States: AT BE CH DE FR GB IT LI LU NL SE (30) Priority: 22.08.1986 GB 19860020455 (71) Applicants: BRONAS LIMITED Londonderry Northern Ireland (GB) NASH, Seamus Londonderry BT47 2AR (GB)	(72) Inventors: BROTHERS, John Londonderry BT47 1BS (GB) NASH, Seamus Waterside, Londonderry BT47 2AR (GB) (74) Representative: Fitzpatrick, Alan James  Fitzpatricks, 4 West Regent Street Glasgow G2 1RS, Scotland Glasgow G2 1RS, Scotland (GB)