(19)

(11)

EP 0 708 699 A1

(12)

(43) Date of publication: 01.05.1996 Bulletin 1996/18 (21) Application number: 94908520.0 (22) Date of filing: 21.02.1994

(51) International Patent Classification (IPC):  B24C 7/ 00( . ) (86) International application number: PCT/NL1994/000041 (87) International publication number: WO 1995/022432 (24.08.1995 Gazette 1995/36)

(84) Designated Contracting States: BE DE IT NL (71) Applicant: Waterkracht B.V. NL-7051 DW Varsseveld (NL)	(72) Inventors: MELLENDIJK, Dick, Willem NL-7051 DW Varsseveld (NL) DEMKES, Johan, Willem NL-7051 DW Varsseveld (NL) (74) Representative: Smulders, Theodorus A.H.J., Ir., et al  Vereenigde Octrooibureaux Nieuwe Parklaan 97 NL-2587 BN 's-Gravenhage NL-2587 BN 's-Gravenhage (NL)