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3846636 | Zehr et al. | Nov 1974 | |
4140576 | Fink et al. | Feb 1979 | |
4361762 | Douglas | Nov 1982 | |
4500563 | Ellenberger et al. | Feb 1985 | |
4649278 | Chutjian et al. | Mar 1987 | |
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5177358 | Roberts et al. | Jan 1993 | |
5466929 | Sakai et al. | Nov 1995 |
Number | Date | Country |
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0 522 296 | Jan 1993 | EPX |
Entry |
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