Number | Date | Country | Kind |
---|---|---|---|
56-086148 | Jun 1981 | JPX | |
56-086149 | Jun 1981 | JPX |
Number | Name | Date | Kind |
---|---|---|---|
4003088 | Schwartz | Jan 1977 |
Number | Date | Country |
---|---|---|
54-111321 | Aug 1979 | JPX |
55-123750 | Sep 1980 | JPX |
Entry |
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Imamura et al, Japanese Journal of Applied Physics, vol. 19, No. 12, 12/80, pp. L731-L734. |