Number | Name | Date | Kind |
---|---|---|---|
3112230 | Rudenberg | Nov 1963 | |
4133698 | Chiang et al. | Jan 1979 | |
4927770 | Swanson | May 1990 |
Number | Date | Country |
---|---|---|
3-165578 | Jul 1991 | JPX |
Entry |
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S. Chiang et al, IEEE Trans. Electron Der., vol. ED-25, Dec. 1978, pp. 1405-1409. |