(19)

(11)

EP 0 495 779 A1

(12)

(43) Date of publication: 29.07.1992 Bulletin 1992/31 (21) Application number: 90910540.0 (22) Date of filing: 26.07.1990

(51) International Patent Classification (IPC):  E04C 2/ 32( . ) E04C 3/ 04( . ) E04C 3/ 07( . ) (86) International application number: PCT/AU1990/000314 (87) International publication number: WO 1991/005926 (02.05.1991 Gazette 1991/10)

(84) Designated Contracting States: AT BE CH DE DK ES FR GB IT LI LU NL SE (30) Priority: 11.10.1989 AU 19890006810 (71) Applicant: JOHNSON, Michael Ian Adamstown, NSW 2289 (AU)	(72) Inventor: JOHNSON, Michael Ian Adamstown, NSW 2289 (AU) (74) Representative: Barlow, Roy James  J.A. KEMP & CO. 14, South Square Gray's Inn London WC1R 5LX London WC1R 5LX (GB)