(19)

(11)

EP 0 208 723 A1

(12)

(43) Date of publication: 21.01.1987 Bulletin 1987/04 (21) Application number: 86900591.0 (22) Date of filing: 06.01.1986

(51) International Patent Classification (IPC):  E02D 17/ 04( . ) E02D 29/ 02( . ) (86) International application number: PCT/AU1986/000004 (87) International publication number: WO 1986/004103 (17.07.1986 Gazette 1986/17)

(84) Designated Contracting States: AT BE CH DE FR GB IT LI LU NL SE (30) Priority: 04.01.1985 AU 19850008777 (71) Applicant: GEARHART AUSTRALIA LIMITED Brisbane, QLD 4000 (AU)	(72) Inventor: GEARHART AUSTRALIA LIMITED Brisbane, QLD 4000 (AU)