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| 6039224 | Dallas, Jr. et al. | Mar 2000 | A |
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| D517916 | Satt | Mar 2006 | S |
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| 20080264961 | Sawyer | Oct 2008 | A1 |
| Number | Date | Country |
|---|---|---|
| 2029252 | Aug 1992 | GB |
| WO DM063106 DE | Feb 2003 | WO |