(19)

(11)

EP 0 318 476 A1

(12)

(43) Date of publication: 07.06.1989 Bulletin 1989/23 (21) Application number: 87903007.0 (22) Date of filing: 27.03.1987

(51) International Patent Classification (IPC):  B24B 45/ 00( . ) B24D 7/ 16( . ) B24D 5/ 16( . ) (86) International application number: PCT/US1987/000716 (87) International publication number: WO 1987/005847 (08.10.1987 Gazette 1987/22)

(84) Designated Contracting States: AT BE CH DE FR GB IT LI LU NL SE (30) Priority: 03.04.1986 US 19860847793 21.01.1987 US 19870005812 21.01.1987 US 19870005813 (71) Applicant: MACKAY, Joseph, Hartley, Jr. San Diego, CA 92127 (US)	(72) Inventor: MACKAY, Joseph, Hartley, Jr. San Diego, CA 92127 (US) (74) Representative: Newstead, Michael John, et al  Page Hargrave Temple Gate House Temple Gate Bristol BS1 6PL Bristol BS1 6PL (GB)