(19)

(11)

EP 0 403 592 A1

(12)

(43) Date of publication: 27.12.1990 Bulletin 1990/52 (21) Application number: 89907799.0 (22) Date of filing: 29.06.1989

(51) International Patent Classification (IPC):  B24D 3/ 00( . ) B24D 11/ 00( . ) B24D 3/ 06( . ) B24D 11/ 02( . ) (86) International application number: PCT/GB1989/000728 (87) International publication number: WO 1990/000105 (11.01.1990 Gazette 1990/02)

(84) Designated Contracting States: AT BE CH DE FR GB IT LI LU NL SE (30) Priority: 30.06.1988 CA 19880570912 (71) Applicants: MITCHELL, Richard, J Ottawa, Ontario (CA) DIABRASIVE INTERNATIONAL LIMITED Ville St.Laurent, Quebec H4R 2K7 (CA)	(72) Inventors: SCHWARTZ, Alexander Montreal, Quebec H3Y 3B7 (CA) ISHAK, Maher Pte Claire, Quebec H9R 4S9 (CA) (74) Representative: Copp, David Christopher, et al  Dummett Copp & Co. 25 The Square Martlesham Heath Ipswich Suffolk IP5 7SL Ipswich Suffolk IP5 7SL (GB)