(19)

(11)

EP 0 390 775 A1

(12)

(43) Date of publication: 10.10.1990 Bulletin 1990/41 (21) Application number: 88900370.0 (22) Date of filing: 15.12.1987

(51) International Patent Classification (IPC):  B24D 3/ 02( . ) B24D 3/ 14( . ) B24D 18/ 00( . ) C04B 14/ 38( . ) B24D 3/ 12( . ) B24D 3/ 34( . ) C04B 14/ 04( . ) (86) International application number: PCT/FI1987/000169 (87) International publication number: WO 1989/005712 (29.06.1989 Gazette 1989/14)

(84) Designated Contracting States: AT BE CH DE FR GB IT LI LU NL SE (71) Applicant: OY PARTEK AB SF-21600 Parainen (FI)	(72) Inventors: SUNDEN, Fred SF-21660 Nagu (FI) PALM, Carl-Olof SF-20500 Turku (FI) NURMI, Toivo SF-21600 Parainen (FI) KEPPO, Martti SF-02180 Espoo (FI) (74) Representative: Geldard, David Guthrie, et al  URQUHART-DYKES AND LORD Tower House Merrion Way Leeds West Yorkshire LS2 8PA Leeds West Yorkshire LS2 8PA (GB)