(19)

(11)

EP 0 359 806 A1

(12)

(43) Date of publication: 28.03.1990 Bulletin 1990/13 (21) Application number: 89904167.0 (22) Date of filing: 20.03.1989

(51) International Patent Classification (IPC):  E01H 1/ 00( . ) (86) International application number: PCT/GB1989/000295 (87) International publication number: WO 1989/008744 (21.09.1989 Gazette 1989/23)

(84) Designated Contracting States: BE DE FR GB IT NL SE (30) Priority: 19.03.1988 GB 19880006585 (71) Applicant: BAILEY, Colin Sommerset (GB)	(72) Inventor: BAILEY, Colin Sommerset (GB) (74) Representative: Austin, Hedley William, et al  Urquhart-Dykes & Lord Alexandra House 1 Alexandra Road Swansea West Glamorgan SA1 5ED Swansea West Glamorgan SA1 5ED (GB)