(19)

(11)

EP 0 366 666 A1

(12)

(43) Date of publication: 09.05.1990 Bulletin 1990/19 (21) Application number: 88904434.0 (22) Date of filing: 20.05.1988

(51) International Patent Classification (IPC):  A01C 5/ 06( . ) A01C 15/ 00( . ) (86) International application number: PCT/AU1988/000153 (87) International publication number: WO 1988/009115 (01.12.1988 Gazette 1988/26)

(84) Designated Contracting States: AT BE CH DE FR GB IT LI LU NL SE (30) Priority: 20.05.1987 AU 19870002022 21.10.1987 AU 19870005001 (71) Applicant: COMMONWEALTH SCIENTIFIC AND INDUSTRIAL RESEARCH ORGANISATION Parkville, VIC 3052 (AU)	(72) Inventors: BLACKWELL, John Yenda, NSW 2681 (AU) JAYAWARDANE, Nihal, Shanthi Griffith, NSW 2680 (AU) BUTLER, Raymond Grenfell, NSW 2810 (AU) (74) Representative: Kinzebach, Werner, Dr., et al  Patentanwälte Reitstötter, Kinzebach und Partner Postfach 86 06 49 D-81633 München D-81633 München (DE)