(19)

(11)

EP 0 250 484 A1

(12)

(43) Date of publication: 07.01.1988 Bulletin 1988/01 (21) Application number: 87900016.0 (22) Date of filing: 12.12.1986

(51) International Patent Classification (IPC):  G01N 27/ 42( . ) (86) International application number: PCT/AU1986/000381 (87) International publication number: WO 1987/003624 (18.06.1987 Gazette 1987/13)

(84) Designated Contracting States: AT BE CH DE FR GB IT LI LU NL SE (30) Priority: 12.12.1985 AU 19850003833 (71) Applicant: WALLACE, Gordon George Wollongong, NSW 2500 (AU)	(72) Inventor: WALLACE, Gordon George Wollongong, NSW 2500 (AU)