(19)

(11)

EP 0 108 781 A1

(12)

(43) Date of publication: 23.05.1984 Bulletin 1984/21 (21) Application number: 83901604.0 (22) Date of filing: 16.05.1983

(51) International Patent Classification (IPC):  G01S 7/ 52( . ) H04R 1/ 32( . ) G10K 11/ 28( . ) (86) International application number: PCT/GB1983/000139 (87) International publication number: WO 1983/004127 (24.11.1983 Gazette 1983/27)

(84) Designated Contracting States: BE DE FR NL SE (30) Priority: 14.05.1982 IE 19820001164 (71) Applicant: CZAJKOWSKI, Stanislaw Boleslan Limerick (IE)	(72) Inventor: CZAJKOWSKI, Stanislaw Boleslan Limerick (IE) (74) Representative: James, Michael John Gwynne  Wynne-Jones, Lainé & James 22, Rodney Road Cheltenham Gloucestershire GL50 1JJ Cheltenham Gloucestershire GL50 1JJ (GB)