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D304155 | Russell et al. | Oct 1989 | |
2987908 | Pelcin | Jun 1961 | |
4911487 | Rachocki | Mar 1990 | |
4951486 | Braun et al. | Aug 1990 | |
4989907 | Edmonds et al. | Feb 1991 | |
5127686 | Gleason et al. | Jul 1992 |