Number | Date | Country | Kind |
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2-227024 | Aug 1990 | JPX |
Number | Name | Date | Kind |
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4659177 | Choe et al. | Apr 1987 | |
4719281 | Choe | Jan 1988 | |
4893888 | Okazaki et al. | Jan 1990 |
Entry |
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S. Umegaka et al, Proces. of SPIE 682, 1986, pp. 187-190. |
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