(19)

(11)

EP 0 302 087 A1

(12)

(43) Date of publication: 08.02.1989 Bulletin 1989/06 (21) Application number: 88901263.0 (22) Date of filing: 01.02.1988

(51) International Patent Classification (IPC):  A63C 19/ 12( . ) E01C 11/ 26( . ) (86) International application number: PCT/EP1988/000068 (87) International publication number: WO 1988/005678 (11.08.1988 Gazette 1988/18)

(84) Designated Contracting States: AT BE CH DE FR GB IT LI LU NL SE (30) Priority: 03.02.1987 IT 19870041514 (71) Applicant: CAVALIERI, Renzo I-41041 Casinalbo (IT)	(72) Inventor: CAVALIERI, Renzo I-41041 Casinalbo (IT) (74) Representative: Modiano, Guido, Dr.-Ing., et al  Modiano & Associati S.r.l. Via Meravigli, 16 I-20123 Milano I-20123 Milano (IT)