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| D303630 | Beechuk et al. | Sep 1989 | |
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| 3536500 | Cleereman et al. | Oct 1970 | |
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| 4372455 | Cochran | Feb 1983 | |
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| 4579260 | Young et al. | Apr 1986 | |
| 4969922 | Platte, Sr. | Nov 1990 | |
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| Number | Date | Country |
|---|---|---|
| 761254 | Feb 1989 | JPX |