(19)

(11)

EP 0 319 574 A1

(12)

(43) Date of publication: 14.06.1989 Bulletin 1989/24 (21) Application number: 88907492.0 (22) Date of filing: 23.06.1988

(51) International Patent Classification (IPC):  B63B 1/ 24( . ) B64C 21/ 04( . ) B64C 21/ 02( . ) B64C 23/ 00( . ) (86) International application number: PCT/US1988/002102 (87) International publication number: WO 1988/010210 (29.12.1988 Gazette 1988/28)

(84) Designated Contracting States: AT BE CH DE FR GB LI NL SE (30) Priority: 25.06.1987 US 19870066223 (71) Applicant: WILLIS, Mark T. San Diego, CA 92122 (US)	(72) Inventor: WILLIS, Mark T. San Diego, CA 92122 (US) (74) Representative: Powell, Stephen David  WILLIAMS, POWELL & ASSOCIATES 34 Tavistock Street London WC2E 7PB London WC2E 7PB (GB)