(19)

(11)

EP 0 407 423 A1

(12)

(43) Date of publication: 16.01.1991 Bulletin 1991/03 (21) Application number: 89903830.0 (22) Date of filing: 13.03.1989

(51) International Patent Classification (IPC):  G08C 15/ 12( . ) (86) International application number: PCT/SE1989/000123 (87) International publication number: WO 1989/008958 (21.09.1989 Gazette 1989/23)

(84) Designated Contracting States: AT BE CH DE FR GB IT LI LU NL (30) Priority: 14.03.1988 SE 19880000896 (71) Applicant: LUNDGREN & NORDSTRAND AB S-211 53 Malmö (SE)	(72) Inventor: LUNDGREN, Sten S-222 25 Lund (SE) (74) Representative: Berglund, Gustav Arthur, et al  AWAPATENT AB, Box 5117 S-200 71 Malmö S-200 71 Malmö (SE)