(19)

(11)

EP 1 266 233 A1

(12)

(43) Date of publication: 18.12.2002 Bulletin 2002/51 (21) Application number: 00980220.8 (22) Date of filing: 12.10.2000

(51) International Patent Classification (IPC)7: G01R 31/00, G01R 31/08, H04R 29/00 (86) International application number: PCT/US0028/191 (87) International publication number: WO 0102/7643 (19.04.2001 Gazette 2001/16)

(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: 12.10.1999 US 158784 P (71) Applicant: Sybesma, Henry William Holland, MI 49423 (US)	(72) Inventor: Sybesma, Henry William Holland, MI 49423 (US) (74) Representative: Stuttard, Garry Philip et al Urquhart-Dykes & LordTower HouseMerrion Way Leeds LS2 8PA Leeds LS2 8PA (GB)