(19)

(11)

EP 0 215 028 A1

(12)

(43) Date of publication: 25.03.1987 Bulletin 1987/13 (21) Application number: 86901305.0 (22) Date of filing: 19.02.1986

(51) International Patent Classification (IPC):  G06F 9/ 28( . ) G06F 9/ 26( . ) G06F 9/ 22( . ) (86) International application number: PCT/AU1986/000041 (87) International publication number: WO 1986/005015 (28.08.1986 Gazette 1986/19)

(84) Designated Contracting States: AT BE CH DE FR GB IT LI LU NL SE (30) Priority: 20.02.1985 AU 19850009383 (71) Applicant: MAGGELAN CORPORATION (AUSTRALIA) PTY. LTD. Perth, W.A. 6000 (AU)	(72) Inventors: BROOKS, David, R. Lelsmurdie, W.A. 6076 (AU) O'SULLIVAN, Daniel, S. Cottesloe, W.A. 6011 (AU) (74) Representative: Boydell, John Christopher, et al  Stevens, Hewlett & Perkins 1 Serjeants' Inn Fleet Street London EC4Y 1LL London EC4Y 1LL (GB)