(19)

(11)

EP 0 587 599 A1

(12)

(43) Date of publication: 23.03.1994 Bulletin 1994/12 (21) Application number: 92910394.0 (22) Date of filing: 26.05.1992

(51) International Patent Classification (IPC):  E06C 7/ 48( . ) (86) International application number: PCT/GB1992/000949 (87) International publication number: WO 1992/021847 (10.12.1992 Gazette 1992/31)

(84) Designated Contracting States: AT BE CH DE DK ES FR GB GR IT LI LU MC NL SE (30) Priority: 31.05.1991 GB 19910011677 (71) Applicants: SMITH SERVICES LIMITED Perth, Pertshire PH1 1PP (GB) QUARTET HOLDINGS LIMITED Jersey, Channel Islands (GB)	(72) Inventor: SMITH, Samuel David Dunning, Pertshire PH2 0ST (GB) (74) Representative: Cooke, William Douglas  Hughes Clark & Co. P.O. Box 22 114/118 Southampton Row London WC1B 5AA London WC1B 5AA (GB)