(19)

(11)

EP 0 250 442 A1

(12)

(43) Date of publication: 07.01.1988 Bulletin 1988/01 (21) Application number: 86902935.0 (22) Date of filing: 22.04.1986

(51) International Patent Classification (IPC):  G01S 17/ 74( . ) (86) International application number: PCT/SE1986/000184 (87) International publication number: WO 1986/006500 (06.11.1986 Gazette 1986/24)

(84) Designated Contracting States: BE DE FR GB NL (30) Priority: 22.04.1985 SE 19850001934 (71) Applicant: BT CARRAGO AKTIEBOLAG S-433 04 Partille (SE)	(72) Inventor: LUNDSTRÖM, Mats S-431 33 Mölndal (SE) (74) Representative: Berglund, Gustav Arthur  AWAPATENT AB, Box 5117 S-200 71 Malmö S-200 71 Malmö (SE)