(19)

(11)

EP 0 427 722 A1

(12)

(43) Date of publication: 22.05.1991 Bulletin 1991/21 (21) Application number: 89903968.0 (22) Date of filing: 22.03.1989

(51) International Patent Classification (IPC):  F03G 7/ 10( . ) (86) International application number: PCT/AU1989/000130 (87) International publication number: WO 1989/009338 (05.10.1989 Gazette 1989/24)

(84) Designated Contracting States: AT BE CH DE FR GB IT LI LU NL SE (30) Priority: 22.03.1988 AU 19880007382 (71) Applicant: SPIJKSTRA, Sjoerd Bairnsdale, VIC 3875 (AU)	(72) Inventor: SPIJKSTRA, Sjoerd Bairnsdale, VIC 3875 (AU) (74) Representative: DIEHL GLAESER HILTL & PARTNER  Patentanwälte Postfach 19 03 65 D-80603 München D-80603 München (DE)