(19)

(11)

EP 0 262 146 A1

(12)

(43) Date of publication: 06.04.1988 Bulletin 1988/14 (21) Application number: 86905165.0 (22) Date of filing: 01.09.1986

(51) International Patent Classification (IPC):  E02D 5/ 74( . ) (86) International application number: PCT/AU1986/000257 (87) International publication number: WO 1987/005647 (24.09.1987 Gazette 1987/21)

(84) Designated Contracting States: AT BE CH DE FR GB IT LI LU NL SE (30) Priority: 17.03.1986 AU 19860005074 19.05.1986 AU 19860057575 (71) Applicants: HOWELL, Norman, Frederick Woody Point, QLD 4019 (AU) COSTELLO, Neil, Edward Clontarf, QLD 4019 (AU)	(72) Inventors: HOWELL, Norman, Frederick Woody Point, QLD 4019 (AU) COSTELLO, Neil, Edward Clontarf, QLD 4019 (AU)