(19)

(11)

EP 0 413 775 A1

(12)

(43) Date of publication: 27.02.1991 Bulletin 1991/09 (21) Application number: 89913213.0 (22) Date of filing: 16.11.1989

(51) International Patent Classification (IPC):  A62B 17/ 04( . ) A62B 18/ 00( . ) (86) International application number: PCT/GB1989/001366 (87) International publication number: WO 1990/005565 (31.05.1990 Gazette 1990/12)

(84) Designated Contracting States: AT BE CH DE ES FR GB IT LI NL SE (30) Priority: 17.11.1988 GB 19880026864 (71) Applicant: WOODVILLE POLYMER ENGINEERING LIMITED Ross-on-Wye Herefordshire HR9 5NF (GB)	(72) Inventor: DE LA PENA, John, Michael, Devereux Nr. Banbury Oxon OX17 1HN (GB) (74) Representative: Hogg, Jeffery Keith, et al  Dowty Group Services Limited Arle Court Cheltenham Gloucestershire, GL51 OTP Cheltenham Gloucestershire, GL51 OTP (GB)