(19)

(11)

EP 0 847 361 A1

(12)

(43) Date of publication: 17.06.1998 Bulletin 1998/25 (21) Application number: 96929423.0 (22) Date of filing: 05.09.1996

(51) International Patent Classification (IPC):  B63G 7/ 02( . ) B63G 8/ 16( . ) (86) International application number: PCT/GB1996/002185 (87) International publication number: WO 1997/010994 (27.03.1997 Gazette 1997/14)

(84) Designated Contracting States: BE DE DK ES FI FR IT NL SE (30) Priority: 21.09.1995 GB 19950019307 (71) Applicant: GEC-MARCONI LIMITED Stanmore, Middlesex HA7 4LY (GB)	(72) Inventor: ADAMS, Richard Hampshire PO3 6PG (GB) (74) Representative: Fitchett, Stuart Paul  GEC Patent Department, Waterhouse Lane Chelmsford, Essex CM1 2QX Chelmsford, Essex CM1 2QX (GB)