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| 5887216 | Motoyama | Mar 1999 | A |
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| 6009153 | Houghton et al. | Dec 1999 | A |
| 6272469 | Koritzinsky et al. | Aug 2001 | B1 |
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| 6490684 | Fenstemaker et al. | Dec 2002 | B1 |
| Entry |
|---|
| Ian Mitchell, Hyperlock counts on growth in DVD Technology, Jun. 20, 1999, Chicago Tribune Newspaper. |
| Peerless Systems Corporation's web site as of Jul. 12, 1999 : http://www.peerless.com. |