(19)

(11)

EP 0 448 617 A1

(12)

(43) Date of publication: 02.10.1991 Bulletin 1991/40 (21) Application number: 90900879.0 (22) Date of filing: 15.12.1989

(51) International Patent Classification (IPC):  E04C 2/ 292( . ) (86) International application number: PCT/FI1989/000234 (87) International publication number: WO 1990/007039 (28.06.1990 Gazette 1990/15)

(84) Designated Contracting States: AT BE CH DE ES FR GB IT LI LU NL SE (30) Priority: 16.12.1988 FI 19880005848 (71) Applicant: OY PARTEK AB SF-21600 Pargas (FI)	(72) Inventors: HESELIUS, Lars SF-21600 Pargas (FI) BRUNILA, Esko SF-21600 Pargas (FI) (74) Representative: Weitzel, Wolfgang, Dr.-Ing.  Friedenstrasse 10 D-89522 Heidenheim D-89522 Heidenheim (DE)