(19)

(11)

EP 0 173 707 A1

(12)

(43) Date of publication: 12.03.1986 Bulletin 1986/11 (21) Application number: 85901037.0 (22) Date of filing: 28.02.1985

(51) International Patent Classification (IPC):  G01C 21/ 00( . ) G01C 13/ 00( . ) G01S 17/ 42( . ) B63B 49/ 00( . ) G01S 15/ 88( . ) G01S 17/ 88( . ) (86) International application number: PCT/GB1985/000080 (87) International publication number: WO 1985/004004 (12.09.1985 Gazette 1985/20)

(84) Designated Contracting States: BE CH DE FR IT LI NL SE (30) Priority: 28.02.1984 GB 19840005099 (71) Applicant: DONNELLY, CONNOLLY & POOTS (N.I.) LIMITED Belfast BT9 6RX Northern Ireland (GB)	(72) Inventor: DONNELLY, Karl Derriaghy Belfast BT17 9HT (GB) (74) Representative: Arthur, John William, et al  FITZPATRICKS, 4 West Regent Street Glasgow G2 1RS, Scotland Glasgow G2 1RS, Scotland (GB)