(19)

(11)

EP 0 131 033 A1

(12)

(43) Date of publication: 16.01.1985 Bulletin 1985/03 (21) Application number: 84900467.0 (22) Date of filing: 23.12.1983

(51) International Patent Classification (IPC):  H04R 25/ 04( . ) H03G 7/ 00( . ) H04R 25/ 00( . ) G10L 11/ 00( . ) H03G 9/ 02( . ) (86) International application number: PCT/US1983/002030 (87) International publication number: WO 1984/002793 (19.07.1984 Gazette 1984/17)

(84) Designated Contracting States: AT BE CH DE FR GB LI LU NL SE (30) Priority: 03.01.1983 US 19830455250 (71) Applicants: HENRICKSON, Larry Keith Ames, IA 50011 (US) HUNTINGTON, Dorothy Allison Stanford, CA 94305 (US)	(72) Inventors: HENRICKSON, Larry Keith Ames, IA 50011 (US) HUNTINGTON, Dorothy Allison Stanford, CA 94305 (US) (74) Representative: Cross, Rupert Edward Blount, et al  BOULT, WADE & TENNANT 27 Furnival Street London EC4A 1PQ London EC4A 1PQ (GB)