(19)

(11)

EP 0 652 998 A1

(12)

(43) Date of publication: 17.05.1995 Bulletin 1995/20 (21) Application number: 94915630.0 (22) Date of filing: 19.05.1994

(51) International Patent Classification (IPC):  E01C 23/ 14( . ) E01C 23/ 20( . ) (86) International application number: PCT/GB1994/001084 (87) International publication number: WO 1994/026982 (24.11.1994 Gazette 1994/26)

(84) Designated Contracting States: AT BE CH DE DK ES FR GB IE IT LI LU NL PT SE (30) Priority: 19.05.1993 GB 19930010333 (71) Applicants: S & S GmbH D-25451 Quiclborn (DE) GLENDINING ROADMARKS LTD. London N17 0XE (GB)	(72) Inventors: GLENDINING, Peter Hayward Woodford Green, Essex 1G8 9EF (GB) BRADFORD, David Hugh Chingford, London E4 7AN (GB) (74) Representative: BATCHELLOR, KIRK & CO.  2 Pear Tree Court Farringdon Road London EC1R 0DS London EC1R 0DS (GB)