(19)

(11)

EP 0 164 342 A1

(12)

(43) Date of publication: 18.12.1985 Bulletin 1985/51 (21) Application number: 84900239.0 (22) Date of filing: 05.12.1983

(51) International Patent Classification (IPC):  H04R 19/ 00( . ) (86) International application number: PCT/US1983/001910 (87) International publication number: WO 1985/002748 (20.06.1985 Gazette 1985/14)

(84) Designated Contracting States: AT CH DE FR GB LI (71) Applicant: POLAROID CORPORATION Cambridge, Massachusetts 02139 (US)	(72) Inventor: REYNARD, John, M. Framingham, MA 01701 (US) (74) Representative: Koch, Günther, Dipl.-Ing., et al  Patentanwälte Wallach, Koch, Dr. Haibach, Feldkamp, Postfach 12 11 20 D-80035 München D-80035 München (DE)