(19)

(11)

EP 0 100 333 A1

(12)

(43) Date of publication: 15.02.1984 Bulletin 1984/07 (21) Application number: 83900547.0 (22) Date of filing: 10.02.1983

(51) International Patent Classification (IPC):  E04B 1/ 58( . ) E04G 25/ 06( . ) E04G 21/ 26( . ) (86) International application number: PCT/AU1983/000019 (87) International publication number: WO 1983/002794 (18.08.1983 Gazette 1983/19)

(84) Designated Contracting States: AT BE CH DE FR GB LI NL SE (30) Priority: 10.02.1982 AU 19820002637 (71) Applicant: McGRATH, Colin Southport, QLD 4215 (AU)	(72) Inventor: McGRATH, Colin Southport, QLD 4215 (AU) (74) Representative: Prüfer, Lutz H., Dipl.-Phys.  Harthauser Strasse 25d D-81545 München D-81545 München (DE)