Number | Name | Date | Kind |
---|---|---|---|
D236168 | Johnson | Jul 1975 | |
D244489 | Johnson | May 1977 | |
D260194 | Carroll et al. | Aug 1981 | |
3387740 | Bockenstette | Jun 1968 | |
4000817 | Sanders et al. | Jan 1977 | |
4093070 | Stahl | Jun 1978 | |
4106623 | Carroll et al. | Aug 1978 | |
4189052 | Carroll et al. | Feb 1980 | |
4426001 | Stahl et al. | Jan 1984 | |
4759451 | Apps | Jul 1988 | |
4982844 | Madan et al. | Jan 1991 | |
5035326 | Stahl | Jul 1991 | |
5287966 | Stahl | Feb 1994 |