(19)

(11)

EP 0 222 836 A1

(12)

(43) Date of publication: 27.05.1987 Bulletin 1987/22 (21) Application number: 86903135.0 (22) Date of filing: 14.05.1986

(51) International Patent Classification (IPC):  A01H 4/ 00( . ) (86) International application number: PCT/AU1986/000136 (87) International publication number: WO 1986/006576 (20.11.1986 Gazette 1986/25)

(84) Designated Contracting States: AT BE CH DE FR GB IT LI LU NL SE (30) Priority: 15.05.1985 AU 19850000569 (71) Applicant: THE COMMONWEALTH INDUSTRIAL GASES LIMITED Chatswood, NSW 206710 (AU)	(72) Inventors: SCHONSTEIN, David, Norman Rose Bay, NSW 2029 (AU) JOHNSON, Brian, Jordayne Gladesville, NSW 2111 (AU) (74) Representative: Opperman, Stuart Richard, et al  Haseltine Lake & Co. Hazlitt House 28 Southampton Buildings Chancery Lane London WC2A 1AT London WC2A 1AT (GB)