(19)

(11)

EP 0 220 267 A1

(12)

(43) Date of publication: 06.05.1987 Bulletin 1987/19 (21) Application number: 86902927.0 (22) Date of filing: 16.04.1986

(51) International Patent Classification (IPC):  G01B 11/ 00( . ) (86) International application number: PCT/SE1986/000174 (87) International publication number: WO 1986/006474 (06.11.1986 Gazette 1986/24)

(84) Designated Contracting States: AT BE CH DE FR GB IT LI LU NL SE (30) Priority: 25.04.1985 GB 19850010535 (71) Applicant: TH STRALFORS AB S-341 00 Ljungby (SE)	(72) Inventor: SUNDBERG, Carl-Axel S-448 00 Floda (SE)