(19)

(11)

EP 0 128 901 A1

(12)

(43) Date of publication: 27.12.1984 Bulletin 1984/52 (21) Application number: 83903483.0 (22) Date of filing: 23.11.1983

(51) International Patent Classification (IPC):  E04H 12/ 18( . ) (86) International application number: PCT/AU1983/000171 (87) International publication number: WO 1984/002372 (21.06.1984 Gazette 1984/15)

(84) Designated Contracting States: DE FR GB (30) Priority: 08.12.1982 AU 19820007173 (71) Applicant: CAVE HOLDINGS PTY. LTD. Kenwick, WA 6107 (AU)	(72) Inventor: CAVE, Colin, Frank Kenwick, W.A. 6107 (AU) (74) Representative: Matthews, Howard Nicholas, et al  Page Hargrave 2 Tower Street London WC2H 9NP London WC2H 9NP (GB)