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---|---|---|---|
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4121088 | Doremus et al. | Oct 1978 | |
4142402 | Mattioli et al. | Mar 1979 | |
4683035 | Hunt et al. | Jul 1987 | |
4686854 | Herman | Aug 1987 | |
4839580 | Moore et al. | Jun 1989 | |
5854557 | Tiefnig | Dec 1998 | |
5888374 | Pope et al. | Mar 1999 |
Entry |
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Patent Abstracts of Japan, JP11-44633A (Kurita Water Ind Ltd) Feb. 16, 1999. |