(19)

(11)

EP 0 041 516 A1

(12)

(43) Date of publication: 16.12.1981 Bulletin 1981/50 (21) Application number: 80902360.0 (22) Date of filing: 03.12.1980

(51) International Patent Classification (IPC):  E04H 4/ 00( . ) (86) International application number: PCT/AU1980/000104 (87) International publication number: WO 1981/001585 (11.06.1981 Gazette 1981/14)

(84) Designated Contracting States: DE FR GB SE (30) Priority: 03.12.1979 AU 19780000015 (71) Applicant: DURACK, Michael James Torwood, Qld. 4066 (AU)	(72) Inventor: DURACK, Michael James Torwood, Qld. 4066 (AU) (74) Representative: Bayliss, Geoffrey Cyril, et al  BOULT, WADE & TENNANT 27 Furnival Street London EC4A 1PQ London EC4A 1PQ (GB)