Number | Date | Country | Kind |
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5-9461 | Apr 1993 | JPX |
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4884331 | Hinshaw | Dec 1989 | |
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5276585 | Smithers | Jan 1994 | |
5287249 | Chen | Feb 1994 | |
5297617 | Herbert | Mar 1994 | |
5309983 | Bailey | May 1994 | |
5335722 | Wu | Aug 1994 |