(19)

(11)

EP 0 494 200 A1

(12)

(43) Date of publication: 15.07.1992 Bulletin 1992/29 (21) Application number: 90914189.0 (22) Date of filing: 21.09.1990

(51) International Patent Classification (IPC):  E01D 21/ 00( . ) E04C 2/ 28( . ) E02D 5/ 03( . ) E01D 101/ 26( . ) (86) International application number: PCT/FI1990/000221 (87) International publication number: WO 1991/005120 (18.04.1991 Gazette 1991/09)

(84) Designated Contracting States: AT BE CH DE DK ES FR GB IT LI LU NL SE (30) Priority: 26.09.1989 FI 19890004535 26.09.1989 FI 19890004536 (71) Applicant: GESERTEK OY SF-45120 Kouvola (FI)	(72) Inventor: RYYNÄNEN, Seppo, Ilmari SF-45120 Kouvola (FI) (74) Representative: Graalfs, Edo, Dipl.-Ing., et al  Postfach 30 24 30 D-20308 Hamburg D-20308 Hamburg (DE)