(19)

(11)

EP 0 131 601 A1

(12)

(43) Date of publication: 23.01.1985 Bulletin 1985/04 (21) Application number: 84900481.0 (22) Date of filing: 11.01.1984

(51) International Patent Classification (IPC):  G01C 9/ 24( . ) (86) International application number: PCT/AU1984/000003 (87) International publication number: WO 1984/002773 (19.07.1984 Gazette 1984/17)

(84) Designated Contracting States: AT BE CH DE FR GB LI LU NL SE (30) Priority: 11.01.1983 AU 19830007564 21.11.1983 AU 19830002479 (71) Applicant: HEATHCLIFF INVESTMENTS PTY. LIMITED Balgowlah Heights, NSW 2093 (AU)	(72) Inventors: HERBERT, John Paddington, NSW 2021 (AU) COLES, Guy, Frederick Balgowlah Heights, NSW 2093 (AU) COLES, Peter, Frederick Balgowlah Heights, NSW 2093 (AU) (74) Representative: Howden, Christopher Andrew, et al  FORRESTER & BOEHMERT Franz-Joseph-Strasse 38 D-80801 München D-80801 München (DE)