| Number | Name | Date | Kind |
|---|---|---|---|
| D169960 | Brill et al. | Jul 1953 | |
| D230189 | Dietz et al. | Jan 1974 | |
| D293136 | Joerger | Dec 1987 | |
| D328801 | Emmerling | Aug 1992 | |
| D352564 | Marischen | Nov 1994 | |
| D367087 | Mathews | Feb 1996 | |
| D374492 | Coe | Oct 1996 | |
| D393911 | Stekelenburg | Apr 1998 | |
| D401367 | Delay | Nov 1998 | |
| D403786 | Lai | Jan 1999 | |
| D408934 | Garrity | Apr 1999 | |
| 5556192 | Wang | Sep 1996 |
| Entry |
|---|
| Intermatic Catalog, pp. 47, 50, 54, 55 (Jan. 1999). |