Number | Date | Country | Kind |
---|---|---|---|
54-166306 | Dec 1979 | JPX | |
55-65052 | May 1980 | JPX |
Number | Name | Date | Kind |
---|---|---|---|
3542544 | Sells et al. | Nov 1970 | |
3542547 | Wilson | Nov 1970 |
Number | Date | Country |
---|---|---|
56-30159 | Jul 1981 | JPX |
Entry |
---|
Research Disclosure 19014, Feb. 1980, (pp. 79-84). |