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3972888 | Lohaus et al. | Aug 1976 | |
4797409 | Lohaus et al. | Jan 1989 | |
4916228 | Reuschling et al. | Apr 1990 | |
5286867 | Lohaus et al. | Feb 1994 |
Number | Date | Country |
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2214608 | Oct 1973 | DEX |
3626210 | Oct 1987 | DEX |
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