(19)

(11)

EP 0 173 719 A1

(12)

(43) Date of publication: 12.03.1986 Bulletin 1986/11 (21) Application number: 85901297.0 (22) Date of filing: 05.03.1985

(51) International Patent Classification (IPC):  E04C 2/ 284( . ) (86) International application number: PCT/AU1985/000038 (87) International publication number: WO 1985/003967 (12.09.1985 Gazette 1985/20)

(84) Designated Contracting States: AT BE CH DE FR GB LI LU NL SE (30) Priority: 05.03.1984 AU 19840003912 27.03.1984 AU 19840004266 (71) Applicant: OATEN, Terrence Robert Nunawading, VIC 3131 (AU)	(72) Inventor: OATEN, Terrence Robert Nunawading, VIC 3131 (AU) (74) Representative: Cockbain, Julian Roderick Michaelson, et al  Frank B. Dehn & Co. European Patent Attorneys Imperial House 15-19, Kingsway London WC2B 6UZ London WC2B 6UZ (GB)