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5019897 | Shirata et al. | May 1991 | |
5245176 | Haugen | Sep 1993 |
Number | Date | Country |
---|---|---|
0452759 | Oct 1991 | EPX |
2635245 | Feb 1990 | FRX |
Entry |
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Patent Abstracts of Japan, vol. 13, No. 401 (E-816), Sep. 6, 1989. |
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