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5551031 | Cheng et al. | Aug 1996 | |
5557791 | Cheng et al. | Sep 1996 | |
5590362 | Baum et al. | Dec 1996 | |
5604892 | Nuttall et al. | Feb 1997 | |
5668994 | Swagerman | Sep 1997 |
Entry |
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