(19)

(11)

EP 0 538 379 A1

(12)

(43) Date of publication: 28.04.1993 Bulletin 1993/17 (21) Application number: 91913485.0 (22) Date of filing: 10.07.1991

(51) International Patent Classification (IPC):  E04B 1/ 00( . ) E04D 3/ 08( . ) E04B 7/ 12( . ) E04B 7/ 06( . ) (86) International application number: PCT/GB1991/001135 (87) International publication number: WO 1992/001122 (23.01.1992 Gazette 1992/03)

(84) Designated Contracting States: BE CH DE DK FR GB LI NL SE (30) Priority: 10.07.1990 GB 19900015148 (71) Applicant: SYCAMORE, Romney Kemsing, North Sevenoaks, Kent TN15 6PP (GB)	(72) Inventor: SYCAMORE, Romney Kemsing, North Sevenoaks, Kent TN15 6PP (GB) (74) Representative: Lerwill, John, et al  A.A. Thornton & Co. Northumberland House 303-306 High Holborn London, WC1V 7LE London, WC1V 7LE (GB)