Number | Date | Country | Kind |
---|---|---|---|
60-200010 | Sep 1985 | JPX | |
60-200012 | Sep 1985 | JPX |
Number | Name | Date | Kind |
---|---|---|---|
3963978 | Kelley et al. | Jun 1976 | |
3968422 | Waldmann | Jul 1976 |
Number | Date | Country |
---|---|---|
63622 | May 1981 | JPX |
3243701 | May 1984 | JPX |
59-139416 | Aug 1984 | JPX |
Entry |
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The Transaction of the Institute of Electrical Engineers of Japan, vol. 103-B, No. 7, Jul. 1981, Hirofumi Akagi et al. |