(19)

(11)

EP 0 485 502 A1

(12)

(43) Date of publication: 20.05.1992 Bulletin 1992/21 (21) Application number: 90912675.0 (22) Date of filing: 06.08.1990

(51) International Patent Classification (IPC):  B24C 5/ 02( . ) B24C 7/ 00( . ) (86) International application number: PCT/GB1990/001222 (87) International publication number: WO 1991/001852 (21.02.1991 Gazette 1991/05)

(84) Designated Contracting States: AT BE CH DE DK ES FR GB IT LI LU NL SE (30) Priority: 07.08.1989 GB 19890017987 10.03.1990 GB 19900005409 (71) Applicant: INSITUFORM GROUP LIMITED Douglas Isle of Man (GB)	(72) Inventor: WOOD, Eric Castletown Isle of Man (GB) (74) Representative: Denmark, James  Bailey, Walsh & Co. 5 York Place Leeds LS1 2SD Yorkshire Leeds LS1 2SD Yorkshire (GB)