Willoughby (148) Limited | 21st October 1997 to 1st December 1997 |
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International Centre For Biomedical Engineering Limited | 1st December 1997 to 3rd February 1999 |
Anglia Medical Technology Limited | 3rd February 1999 to 23rd April 2004 |
Captum Capital Limited | 23rd April 2004 to current |