(19)

(11)

EP 0 364 506 A1

(12)

(43) Date of publication: 25.04.1990 Bulletin 1990/17 (21) Application number: 89900629.0 (22) Date of filing: 12.12.1988

(51) International Patent Classification (IPC):  E01C 13/ 00( . ) E01C 19/ 46( . ) E01C 23/ 03( . ) E01C 13/ 08( . ) E01C 19/ 52( . ) (86) International application number: PCT/GB1988/001094 (87) International publication number: WO 1989/005885 (29.06.1989 Gazette 1989/14)

(84) Designated Contracting States: AT BE CH DE FR IT LI LU NL SE (30) Priority: 16.12.1987 GB 19870029302 (71) Applicant: LEWIS, Philip Graham Bournemouth BH5 0NL (GB)	(72) Inventors: LEWIS, Philip, Graham Bournemouth BH5 0NL (GB) PRATT, David, John Leicestershire LE10 0RL (GB) (74) Representative: Boutland, John Anthony, et al  Barker, Brettell & Boutland Prudential Buildings 97-101 Above Bar Street Southampton SO9 4GT Southampton SO9 4GT (GB)