(19)

(11)

EP 0 216 824 A1

(12)

(43) Date of publication: 08.04.1987 Bulletin 1987/15 (21) Application number: 86901748.0 (22) Date of filing: 13.03.1986

(51) International Patent Classification (IPC):  E01B 7/ 14( . ) (86) International application number: PCT/AU1986/000064 (87) International publication number: WO 1986/006118 (23.10.1986 Gazette 1986/23)

(84) Designated Contracting States: AT BE CH DE FR GB IT LI LU NL SE (30) Priority: 09.04.1985 AU 19850000055 (71) Applicant: GLASPY, James Keith Malanda, QLD 4885 (AU)	(72) Inventor: GLASPY, James Keith Malanda, QLD 4885 (AU)