(19)

(11)

EP 0 113 732 A1

(12)

(43) Date of publication: 25.07.1984 Bulletin 1984/30 (21) Application number: 83901888.0 (22) Date of filing: 27.06.1983

(51) International Patent Classification (IPC):  H04R 9/ 00( . ) H04R 9/ 04( . ) (86) International application number: PCT/AU1983/000084 (87) International publication number: WO 1984/000460 (02.02.1984 Gazette 1984/03)

(84) Designated Contracting States: DE FR GB NL (30) Priority: 19.07.1982 AU 19820004924 13.09.1982 AU 19820005845 19.11.1982 AU 19820006877 (71) Applicants: CLARKE, Anthony Bernard City Beach WA 6015 (AU) EVANS, Grant William City Beach WA 6015 (AU)	(72) Inventors: CLARKE, Anthony Bernard City Beach WA 6015 (AU) EVANS, Grant William City Beach WA 6015 (AU) (74) Representative: Matthews, Howard Nicholas, et al  Page Hargrave 2 Tower Street London WC2H 9NP London WC2H 9NP (GB)