Number | Name | Date | Kind |
---|---|---|---|
3547730 | Cohen et al. | Dec 1970 | |
3573975 | Dhaka et al. | Apr 1971 | |
4201581 | Thomas et al. | May 1980 | |
4281922 | Matsumoto | Aug 1981 |
Number | Date | Country |
---|---|---|
4829727 | Sep 1973 | JPX |
Entry |
---|
Tokyo Ohka Kogyo Co., Ltd., YN2000, Sep. 1981, Japan. |