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| 360049 | Raymond et al. | Mar 1887 | |
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| 1616763 | Siebert | Feb 1927 | |
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| 4993077 | Robison | Feb 1991 | |
| 5014356 | Tomasi-Dubois | May 1991 | |
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| 5168582 | Aldridge | Dec 1992 | |
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| 5497923 | Pearson et al. | Mar 1996 | |
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| Number | Date | Country |
|---|---|---|
| 0 059 682 | Sep 1982 | EPX |
| 2 686 779 | Aug 1993 | FRX |
| 1 902 046 | Aug 1970 | DEX |
| 2 140 134 | Feb 1973 | DEX |
| Entry |
|---|
| PCT International Search Report for Application No. PCT/US98/24689. |