Number | Date | Country | Kind |
---|---|---|---|
3936561 | Nov 1989 | DEX |
Number | Name | Date | Kind |
---|---|---|---|
2307332 | Parsons | Jan 1943 | |
4158689 | Pett et al. | Jun 1979 | |
4207371 | Otto | Jun 1980 | |
4265794 | Pett et al. | May 1981 |
Entry |
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Chemical Abstract No. 139 566 K, Oct. 19, 1987, p. 337. |