(19)

(11)

EP 0 377 555 A1

(12)

(43) Date of publication: 18.07.1990 Bulletin 1990/29 (21) Application number: 87905263.0 (22) Date of filing: 24.08.1987

(51) International Patent Classification (IPC):  G01N 15/ 06( . ) G01R 33/ 12( . ) G01N 27/ 72( . ) (86) International application number: PCT/GB1987/000594 (87) International publication number: WO 1989/002083 (09.03.1989 Gazette 1989/06)

(84) Designated Contracting States: AT BE CH DE FR IT LI LU NL SE (71) Applicants: PARKER, Dennis Amerena Ferndale, Mid Glamorgan CF43 4SU (GB) PARKER, Richard Vincent Ferndale, Mid Glamorgan CF43 4SU (GB)	(72) Inventors: PARKER, Dennis Amerena Ferndale, Mid Glamorgan CF43 4SU (GB) PARKER, Richard Vincent Ferndale, Mid Glamorgan CF43 4SU (GB) (74) Representative: James, Michael John Gwynne, et al  Wynne-Jones, Lainé & James Morgan Arcade Chambers 33, St. Mary Street Cardiff Clamorgan CF1 2AB Cardiff Clamorgan CF1 2AB (GB)