(19)

(11)

EP 0 309 516 A1

(12)

(43) Date of publication: 05.04.1989 Bulletin 1989/14 (21) Application number: 88902907.0 (22) Date of filing: 06.04.1988

(51) International Patent Classification (IPC):  E01F 15/ 00( . ) E01F 15/ 08( . ) E01F 15/ 04( . ) (86) International application number: PCT/GB1988/000266 (87) International publication number: WO 1988/008057 (20.10.1988 Gazette 1988/23)

(84) Designated Contracting States: AT BE DE FR GB (30) Priority: 09.04.1987 GB 19870008549 (71) Applicant: COSTELLOE, John St. Martins, Guernsey (GB)	(72) Inventor: COSTELLOE, John St. Martins, Guernsey (GB) (74) Representative: Frankland, Nigel Howard  FORRESTER & BOEHMERT Franz-Joseph-Strasse 38 D-80801 München D-80801 München (DE)