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| D378660 | Ota et al. | Apr 1997 | |
| D395914 | Yoshino et al. | Jul 1998 | |
| 4084165 | Skafvenstedt et al. | Apr 1978 | |
| 4183031 | Kyser et al. | Jan 1980 | |
| 4982200 | Ramsay | Jan 1991 | |
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| 5329294 | Ontawar et al. | Jul 1994 | |
| 5400573 | Crustal et al. | Mar 1995 | |
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