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3965124 | Eder et al. | Jun 1976 | |
4057562 | Balli et al. | Nov 1977 | |
4470990 | Asselin et al. | Sep 1984 | |
4857516 | Terao et al. | Aug 1989 | |
4943589 | Crews et al. | Jul 1990 |
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