Number | Name | Date | Kind |
---|---|---|---|
D217131 | Shreve et al. | Apr 1970 | |
D219334 | Shreve et al. | Dec 1970 | |
3481453 | Shreve et al. | Dec 1969 | |
3847276 | Lehner et al. | Nov 1974 | |
3987893 | Hanson | Oct 1976 | |
4155445 | Roccaforte | May 1979 | |
4162008 | McCalmont | Jul 1979 | |
4213598 | Halasz | Jul 1980 |