(19)

(11)

EP 0 172 173 A1

(12)

(43) Date of publication: 26.02.1986 Bulletin 1986/09 (21) Application number: 84903425.0 (22) Date of filing: 12.09.1984

(51) International Patent Classification (IPC):  G08B 13/ 14( . ) (86) International application number: PCT/AU1984/000178 (87) International publication number: WO 1985/003791 (29.08.1985 Gazette 1985/19)

(84) Designated Contracting States: AT BE CH DE FR GB LI LU NL SE (30) Priority: 23.02.1984 AU 19840024854 (71) Applicant: COLLINS, Ronald Arthur Umina, NSW 2257 (AU)	(72) Inventor: COLLINS, Ronald Arthur Umina, NSW 2257 (AU)