(19)

(11)

EP 0 102 374 A1

(12)

(43) Date of publication: 14.03.1984 Bulletin 1984/11 (21) Application number: 83900847.0 (22) Date of filing: 08.03.1983

(51) International Patent Classification (IPC):  B02C 4/ 08( . ) B02C 18/ 28( . ) B02C 4/ 30( . ) (86) International application number: PCT/GB1983/000062 (87) International publication number: WO 1983/003062 (15.09.1983 Gazette 1983/21)

(84) Designated Contracting States: AT BE CH DE FR GB LI LU NL SE (30) Priority: 09.03.1982 GB 19820006820 (71) Applicant: MMD DESIGN AND CONSULTANCY LIMITED Somercotes Derbyshire DE55 4NJ (GB)	(72) Inventor: POTTS, Alan Nottingham NG1 9DA (GB)