(19)

(11)

EP 0 074 961 A1

(12)

(43) Date of publication: 30.03.1983 Bulletin 1983/13 (21) Application number: 82900778.0 (22) Date of filing: 17.03.1982

(51) International Patent Classification (IPC):  E04H 4/ 12( . ) (86) International application number: PCT/AU1982/000033 (87) International publication number: WO 1982/003239 (30.09.1982 Gazette 1982/23)

(84) Designated Contracting States: AT BE CH DE FR GB LI LU NL SE (30) Priority: 18.03.1981 AU 19810008045 (71) Applicant: P.G. NOMINEES PTY. LIMITED Parker & Randall Solicitors Newcastle, N.S.W. 2300 (AU)	(72) Inventor: CANT, Peter Reid Woollahra, N.S.W. 2025 (AU) (74) Representative: Hartley, David, et al  Withers & Rogers 4 Dyer's Buildings Holborn London, EC1N 2JT London, EC1N 2JT (GB)