(19)

(11)

EP 0 118 497 A1

(12)

(43) Date of publication: 19.09.1984 Bulletin 1984/38 (21) Application number: 83902799.0 (22) Date of filing: 07.09.1983

(51) International Patent Classification (IPC):  F04B 47/ 04( . ) F04B 47/ 08( . ) (86) International application number: PCT/AU1983/000124 (87) International publication number: WO 1984/001002 (15.03.1984 Gazette 1984/07)

(84) Designated Contracting States: DE FR SE (30) Priority: 09.09.1982 AU 19820005822 (71) Applicant: MACLEOD, Donald Ian Guy Geraldton WA 6530 (AU)	(72) Inventor: MACLEOD, Donald Ian Guy Geraldton WA 6530 (AU) (74) Representative: Roos, Michael John  KILBURN & STRODE 30 John Street London WC1N 2DD London WC1N 2DD (GB)