(19)

(11)

EP 0 511 320 A1

(12)

(43) Date of publication: 04.11.1992 Bulletin 1992/45 (21) Application number: 91904987.0 (22) Date of filing: 18.01.1991

(51) International Patent Classification (IPC):  G01B 21/ 00( . ) G06F 3/ 043( . ) G06F 3/ 033( . ) G08C 21/ 00( . ) (86) International application number: PCT/US1991/000434 (87) International publication number: WO 1991/010981 (25.07.1991 Gazette 1991/17)

(84) Designated Contracting States: DE FR GB IT NL (30) Priority: 19.01.1990 US 19900467632 16.03.1990 US 19900495361 19.03.1990 US 19900495330 (71) Applicant: SCIENCE ACCESSORIES CORP. Stratford, CT 06497 (US)	(72) Inventors: BUTLER, Robert Milford, CT 06460 (US) SCHORUM, Stanley Madison, CT 06443 (US) SINDEBAND, Seymour, J. Pound Ridge, NY 10576 (US) (74) Representative: Skone James, Robert Edmund  GILL JENNINGS & EVERY Broadgate House 7 Eldon Street London EC2M 7LH London EC2M 7LH (GB)