Number | Date | Country | Kind |
---|---|---|---|
36361/74 | Aug 1974 | UK |
Number | Name | Date | Kind |
---|---|---|---|
2276587 | Mettler et al. | Mar 1942 | |
3293295 | Swakon et al. | Dec 1966 |
Entry |
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Yoneyama, Derwent Abstract, JA-4742713-Q (1972). |
Yoneyama, Derwent Abstract, JA-4861402-Q (1973). |