(19)

(11)

EP 1 155 291 A1

(12)

(43) Date of publication: 21.11.2001 Bulletin 2001/47 (21) Application number: 99973324.9 (22) Date of filing: 10.12.1999

(51) International Patent Classification (IPC)7: G01F 9/00, G01F 23/00, G01F 23/68 (86) International application number: PCT/ZA9900/135 (87) International publication number: WO 0034/749 (15.06.2000 Gazette 2000/24)

(84) Designated Contracting States: AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE Designated Extension States: AL LT LV MK RO SI (30) Priority: 11.12.1998 ZA 9811367 (71) Applicant: Ekermans, Wilhelm Eugene Riebbeek Kasteel 7307 (ZA)	(72) Inventor: Ekermans, Wilhelm Eugene Riebbeek Kasteel 7307 (ZA) (74) Representative: Schlich, George William et al Mathys & Squire100 Gray's Inn Road London WC1X 8AL London WC1X 8AL (GB)