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| 1906427 | Sievers et al. | May 1933 | |
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| 2124521 | Williams et al. | Jul 1938 | |
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| Number | Date | Country |
|---|---|---|
| 936382 U | Dec 1955 | DEX |
| 533716 | Oct 1976 | SUX |
| Number | Date | Country | |
|---|---|---|---|
| Parent | 33599 | Jan 1995 |