(19)

(11)

EP 0 230 443 A1

(12)

(43) Date of publication: 05.08.1987 Bulletin 1987/32 (21) Application number: 86904247.0 (22) Date of filing: 20.06.1986

(51) International Patent Classification (IPC):  G01N 23/ 08( . ) G01T 7/ 08( . ) G01T 1/ 20( . ) G01V 5/ 00( . ) (86) International application number: PCT/GB1986/000362 (87) International publication number: WO 1986/007638 (31.12.1986 Gazette 1986/28)

(84) Designated Contracting States: AT BE CH DE FR GB IT LI LU NL SE (30) Priority: 21.06.1985 GB 19850015812 (71) Applicant: Goring Kerr plc Windsor, Berkshire SL4 5JX (GB)	(72) Inventor: JOHNSON, Edwin, George Wargrave Berkshire (GB) (74) Representative: Frankland, Nigel Howard, et al  FORRESTER & BOEHMERT Franz-Joseph-Strasse 38 D-80801 München D-80801 München (DE)