(19)

(11)

EP 0 513 320 A1

(12)

(43) Date of publication: 19.11.1992 Bulletin 1992/47 (21) Application number: 92901388.0 (22) Date of filing: 26.08.1991

(51) International Patent Classification (IPC):  B23C 3/ 35( . ) (86) International application number: PCT/US1991/006651 (87) International publication number: WO 1992/007677 (14.05.1992 Gazette 1992/11)

(84) Designated Contracting States: DE FR GB IT (30) Priority: 25.10.1990 US 19900602154 (71) Applicant: BUSH, Robert, C. East Saint Louis, IL 62201 (US)	(72) Inventor: BUSH, Robert, C. East Saint Louis, IL 62201 (US) (74) Representative: MacGregor, Gordon, et al  ERIC POTTER CLARKSON St. Mary's Court St. Mary's Gate Nottingham, NG1 1LE Nottingham, NG1 1LE (GB)