(19)

(11)

EP 0 034 612 A1

(12)

(43) Date of publication: 02.09.1981 Bulletin 1981/35 (21) Application number: 80901634.0 (22) Date of filing: 27.08.1980

(51) International Patent Classification (IPC):  A61M 5/ 168( . ) (86) International application number: PCT/AU1980/000053 (87) International publication number: WO 1981/000519 (05.03.1981 Gazette 1981/06)

(84) Designated Contracting States: AT DE FR GB NL SE (30) Priority: 27.08.1979 AU 19790000199 27.12.1979 AU 19790001845 (71) Applicant: COMMONWEALTH AIRCRAFT CORPORATION LIMITED Port Melbourne, Vic. 3207 (AU)	(72) Inventors: PARKIN, William Geoffrey Canterbury, Vic. 3126 (AU) McGUINNES, Clifford North Balwyn, Vic. 3104 (AU) KROCHMAL, Michael Simon Ormond, Vic. 3204 (AU) FODEN, Peter Jeremy East Brighton, Vic. 3187 (AU)