(19)

(11)

EP 0 080 473 A1

(12)

(43) Date of publication: 08.06.1983 Bulletin 1983/23 (21) Application number: 82901605.0 (22) Date of filing: 04.06.1982

(51) International Patent Classification (IPC):  A01B 15/ 02( . ) C04B 37/ 02( . ) B22F 7/ 06( . ) E02F 9/ 28( . ) (86) International application number: PCT/GB1982/000167 (87) International publication number: WO 1982/004375 (23.12.1982 Gazette 1982/30)

(84) Designated Contracting States: AT BE CH DE FR GB LI LU NL SE (30) Priority: 09.06.1981 GB 19810017625 (71) Applicant: ANDERMAN & RYDER LIMITED London SE1 2RA (GB)	(72) Inventors: REAL, Michael William Surbiton Surrey (GB) COOPER, Derek Redvers Surrey KT12 4PT (GB)