(19)

(11)

EP 0 575 451 A1

(12)

(43) Date of publication: 29.12.1993 Bulletin 1993/52 (21) Application number: 92907147.0 (22) Date of filing: 20.03.1992

(51) International Patent Classification (IPC):  E04G 23/ 02( . ) (86) International application number: PCT/AU1992/000120 (87) International publication number: WO 1992/016707 (01.10.1992 Gazette 1992/25)

(84) Designated Contracting States: DE FR GB (30) Priority: 21.03.1991 AU 19910005196 (71) Applicant: SVENIC AUSTRALIA PTY. Ltd. Caringbah, NSW 2229 (AU)	(72) Inventor: COUNDOURIS, Peter Oyster Bay, NSW 2225 (AU) (74) Representative: Tillbrook, Christopher John  Chris J Tillbrook & Co 5 Old Rectory Close Churchover Rugby, Warwickshire CV23 0EN Rugby, Warwickshire CV23 0EN (GB)