Number | Date | Country | Kind |
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4226995 | Demosthene et al. | Oct 1980 | |
5266697 | Escher et al. | Nov 1993 | |
5378845 | Escher et al. | Jan 1995 |
Number | Date | Country |
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0006062 | Dec 1979 | EPX |
0514551 | Nov 1992 | EPX |
0547411 | Jun 1993 | EPX |
0582288 | Feb 1994 | EPX |
Entry |
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