(19)

(11)

EP 0 233 870 A1

(12)

(43) Date of publication: 02.09.1987 Bulletin 1987/36 (21) Application number: 85905313.0 (22) Date of filing: 29.10.1985

(51) International Patent Classification (IPC):  E04H 12/ 12( . ) E04H 12/ 16( . ) (86) International application number: PCT/AU1985/000259 (87) International publication number: WO 1986/002689 (09.05.1986 Gazette 1986/10)

(84) Designated Contracting States: AT BE CH DE FR GB IT LI LU NL SE (30) Priority: 31.10.1984 AU 19840007924 29.01.1985 AU 19850009048 (71) Applicant: R.F.D. CONSULTANTS PTY. LTD. Melbourne, VIC 3000 (AU)	(72) Inventor: KNIGHT, John, Keith Doncaster, VIC 3108 (AU)