(19)

(11)

EP 0 555 459 A1

(12)

(43) Date of publication: 18.08.1993 Bulletin 1993/33 (21) Application number: 92918973.0 (22) Date of filing: 07.09.1992

(51) International Patent Classification (IPC):  E02F 3/ 88( . ) E02F 7/ 06( . ) E02F 5/ 28( . ) (86) International application number: PCT/GB1992/001631 (87) International publication number: WO 1993/005243 (18.03.1993 Gazette 1993/08)

(84) Designated Contracting States: AT BE CH DE DK ES FR GB GR IE IT LI LU MC NL SE (30) Priority: 05.09.1991 GB 19910019008 (71) Applicant: PORT MANAGEMENT SERVICES LIMITED London W1V 9HF (GB)	(72) Inventor: PACKHAM, Christopher Port Ramsgate Kent CT11 8RP (GB) (74) Representative: Powell, Stephen David, et al  WILLIAMS, POWELL & ASSOCIATES 34 Tavistock Street London WC2E 7PB London WC2E 7PB (GB)