(19)

(11)

EP 0 438 488 A1

(12)

(43) Date of publication: 31.07.1991 Bulletin 1991/31 (21) Application number: 89911835.0 (22) Date of filing: 13.10.1989

(51) International Patent Classification (IPC):  B63B 1/ 12( . ) B63B 1/ 14( . ) (86) International application number: PCT/GB1989/001218 (87) International publication number: WO 1990/003912 (19.04.1990 Gazette 1990/09)

(84) Designated Contracting States: AT BE CH DE FR GB IT LI LU NL SE (30) Priority: 15.10.1988 GB 19880024210 (71) Applicant: STEWKIE SYSTEMS LIMITED Herts. AL8 7NA (GB)	(72) Inventor: STEWART, Keith Melbury Osmond, Dorset DT2 OLS (GB) (74) Representative: Funge, Harry, et al  WILSON, GUNN & ELLIS 41-51 Royal Exchange Cross Street Manchester M2 7BD Manchester M2 7BD (GB)