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| 4179249 | Guttmann | Dec 1979 | |
| 4184815 | Casson et al. | Jan 1980 | |
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| 4482347 | Borsanyi | Nov 1984 | |
| 4493706 | Borsanyi et al. | Jan 1985 | |
| 4515535 | D'Silva | May 1985 | |
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| 4552516 | Stanley | Nov 1985 | |
| 4558996 | Becker | Dec 1985 | |
| 4559040 | Horres et al. | Dec 1985 | |
| 4599055 | Dykstra | Jul 1986 | |
| 4653987 | Tsuji et al. | Mar 1987 | |
| 4720249 | Krebs et al. | Jan 1988 | |
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| 4813855 | Leveen et al. | Mar 1989 | |
| 4832584 | Nassif | May 1989 | |
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| Number | Date | Country |
|---|---|---|
| 0107440 | May 1984 | EPX |
| 0173075 | Mar 1986 | EPX |
| 57-203891 | Dec 1982 | JPX |
| 2208897 | Apr 1989 | GBX |
| Entry |
|---|
| "Frenta-System for Continuous Tube Feeding", Fresenius AG 1983. |
| Number | Date | Country | |
|---|---|---|---|
| Parent | 538791 | Jun 1990 |