Number | Date | Country | Kind |
---|---|---|---|
3730921 | Sep 1987 | DEX |
Number | Name | Date | Kind |
---|---|---|---|
3923766 | Barter | Dec 1975 | |
3978032 | Maurer | Aug 1976 | |
4123408 | Gordon | Oct 1978 |
Entry |
---|
CA 84 (10): 67874r, Yakhimovich et al., 10/5/75. |
JP57100110, Tokuyama Soda KK-6/82. |