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| D237222 | Moore | Oct 1975 | |
| D237554 | Hurst | Nov 1975 | |
| D255268 | Bernstein | Jun 1980 | |
| D267116 | Bubelis | Nov 1982 | |
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| D285839 | Roehrig | Sep 1986 | |
| D303839 | Fitzpatrick et al. | Oct 1989 | |
| D312312 | Herritz | Nov 1990 | |
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| D338274 | Chuang | Aug 1993 | |
| D359808 | Raghava | Jun 1995 | |
| D376014 | McKenney | Nov 1996 | |
| D380836 | Fitzpatrick et al. | Jul 1997 | |
| 3267937 | Verschoor | Aug 1966 | |
| 3669117 | Herbst | Jun 1972 | |
| 3825014 | Wroten | Jul 1974 | |
| 3924621 | Cassimally | Dec 1975 | |
| 4132232 | Lerner | Jan 1979 | |
| 4195638 | Duckstein | Apr 1980 | |
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| 4909253 | Cook et al. | Mar 1990 | |
| 5004473 | Kalantar | Apr 1991 | |
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