(19)

(11)

EP 0 064 549 A1

(12)

(43) Date of publication: 17.11.1982 Bulletin 1982/46 (21) Application number: 82900058.0 (22) Date of filing: 03.11.1981

(51) International Patent Classification (IPC):  G09B 17/ 00( . ) (86) International application number: PCT/US1981/001486 (87) International publication number: WO 1982/001613 (13.05.1982 Gazette 1982/12)

(84) Designated Contracting States: AT CH DE FR GB LI NL (30) Priority: 05.11.1980 US 19800203552 (71) Applicant: BOSSART, Marion C. La Jolla, CA 92037 (US)	(72) Inventor: BOSSART, Marion C. La Jolla, CA 92037 (US) (74) Representative: MacGregor, Gordon  ERIC POTTER CLARKSON St. Mary's Court St. Mary's Gate Nottingham, NG1 1LE Nottingham, NG1 1LE (GB)