Number | Name | Date | Kind |
---|---|---|---|
4256992 | Luursema | Mar 1981 | |
4682080 | Ogawa et al. | Jul 1987 | |
4746841 | Ogawa | May 1988 | |
4928039 | Nilssen | May 1990 | |
4937498 | Bolhuis et al. | Jun 1990 | |
4954749 | Crawford | Sep 1990 | |
5059868 | El-Hamamsy et al. | Oct 1991 |
Entry |
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Japanese abstract 3,184,299A Aug. 12, 1991. |