(19)

(11)

EP 0 236 363 A1

(12)

(43) Date of publication: 16.09.1987 Bulletin 1987/38 (21) Application number: 86905173.0 (22) Date of filing: 09.09.1986

(51) International Patent Classification (IPC):  E04G 21/ 12( . ) (86) International application number: PCT/AU1986/000266 (87) International publication number: WO 1987/001313 (12.03.1987 Gazette 1987/06)

(84) Designated Contracting States: AT BE CH DE FR GB IT LI LU NL SE (30) Priority: 09.09.1985 AU 19850002336 (71) Applicant: STAVDAL, Odd Aage Ramsgate, NSW 2217 (AU)	(72) Inventor: STAVDAL, Odd Aage Ramsgate, NSW 2217 (AU)