(19)

(11)

EP 0 221 098 A1

(12)

(43) Date of publication: 13.05.1987 Bulletin 1987/20 (21) Application number: 86902448.0 (22) Date of filing: 11.04.1986

(51) International Patent Classification (IPC):  B63C 11/ 40( . ) E02B 17/ 00( . ) (86) International application number: PCT/GB1986/000204 (87) International publication number: WO 1986/006121 (23.10.1986 Gazette 1986/23)

(84) Designated Contracting States: AT BE CH DE FR GB IT LI LU NL SE (30) Priority: 11.04.1985 GB 19850009285 (71) Applicants: MAPLE ENGINEERING PROJECTS LIMITED Great Yarmouth, Norfolk (GB) HARWOOD, Susan, Brenda Great Yarmouth, Norfolk (GB)	(72) Inventors: HARWOOD, Anthony, Jack 25 Harboard Crescent Norfolk (GB) ALGER, David 273 Victoria Road Suffolk (GB) HARWOOD, Susan, Brenda 25 Harboard Crescent Norfolk (GB) (74) Representative: Jones, William  Willow Lane House Willow Lane Norwich NR2 1EU Norwich NR2 1EU (GB)