(19)

(11)

EP 0 538 281 A1

(12)

(43) Date of publication: 28.04.1993 Bulletin 1993/17 (21) Application number: 91911320.0 (22) Date of filing: 12.06.1991

(51) International Patent Classification (IPC):  B61L 27/ 00( . ) G08G 1/ 00( . ) (86) International application number: PCT/SE1991/000423 (87) International publication number: WO 1991/019633 (26.12.1991 Gazette 1991/29)

(84) Designated Contracting States: AT BE CH DE DK ES FR GB IT LI NL SE (30) Priority: 12.06.1990 SE 19900002084 (71) Applicant: ABY, Stig S-560 25 Bottnaryd (SE)	(72) Inventor: ABY, Stig S-560 25 Bottnaryd (SE) (74) Representative: Engström, Christer  Smultronvägen 61 S-331 00 Värnamo S-331 00 Värnamo (SE)