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3542453 | Kantor | Nov 1970 | |
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4610757 | Khoe et al. | Sep 1986 | |
5004673 | Vlannes | Apr 1991 | |
5389313 | Imataki et al. | Feb 1995 |
Number | Date | Country |
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58-125084 | Jul 1983 | JPX |
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