| Number | Date | Country | Kind |
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| 9726716 | Dec 1997 | GBX |
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| Number | Date | Country |
|---|---|---|
| 2143570 | Feb 1985 | GBX |
| 9114060 | Sep 1991 | WOX |
| Entry |
|---|
| Search Report of UK Patent Office, UK Patent Application No. GB 9826585.3 Date of search Mar. 12, 1999. |