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5480607 | Hobson | Jan 1996 | |
5700366 | Steblianko et al. | Dec 1997 | |
5766649 | Azuma | Jun 1998 |
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0430623 | Jun 1991 | EPX |
496238 | Mar 1992 | JPX |
533543 | Dec 1993 | JPX |
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