(19)

(11)

EP 0 857 244 A1

(12)

(43) Date of publication: 12.08.1998 Bulletin 1998/33 (21) Application number: 96935072.0 (22) Date of filing: 24.10.1996

(51) International Patent Classification (IPC):  E04C 2/ 292( . ) E04C 2/ 36( . ) (86) International application number: PCT/GB1996/002598 (87) International publication number: WO 1997/015736 (01.05.1997 Gazette 1997/19)

(84) Designated Contracting States: AT BE CH DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE (30) Priority: 24.10.1995 GB 19950021713 13.12.1995 GB 19950025470 (60) Divisional application: 99122668.9 / 0980937 (71) Applicant: H.H. Robertson (U.K.) Limited South Wirral Cheshire L65 4DS (GB)	(72) Inventor: WOOD, Ian, Philip Cheshire CH1 6NW (GB) (74) Representative: Fry, Alan Valentine, et al  FRY HEATH & SPENCE The Old College 53 High Street Horley Surrey RH6 7BN Horley Surrey RH6 7BN (GB)