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5224731 | Johnson | Jul 1993 | A |
5253888 | Friedrich | Oct 1993 | A |
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5558358 | Johnson | Sep 1996 | A |
5560627 | Zatulovsky et al. | Oct 1996 | A |
5865457 | Knabusch et al. | Feb 1999 | A |
7052023 | Chen et al. | May 2006 | B2 |
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