Number | Name | Date | Kind |
---|---|---|---|
3865113 | Sharon et al. | Feb 1975 | |
3865114 | Sharon | Feb 1975 | |
4015906 | Sharon | Apr 1977 | |
4123143 | Yachin et al. | Oct 1978 | |
4228341 | Zandberg | Oct 1980 | |
4597380 | Raif et al. | Jul 1986 | |
4721274 | Erb | Jan 1988 | |
4798452 | Erb | Jan 1989 | |
4887894 | Gluzerman et al. | Dec 1989 |