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| 198 43 252 | Sep 1998 | DE |
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| 4138735 | Allocca et al. | Feb 1979 | A |
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| 6153835 | Schwartz et al. | Nov 2000 | A |
| Number | Date | Country |
|---|---|---|
| 38 23 719 | Jan 1989 | DE |
| 0 373 971 | Jun 1990 | EP |
| 0 717 376 | Jun 1996 | EP |
| WO 9857305 | Dec 1998 | WO |
| Entry |
|---|
| No author; Pitney Bowes introduces PostPerfect; Sep. 12, 1995; Business Wire; dialog copy pp. 1-3. |