| Number | Name | Date | Kind |
|---|---|---|---|
| D127928 | Wellman | Jun 1941 | |
| D197159 | Nelson et al. | Dec 1963 | |
| D242099 | Casey | Nov 1976 | |
| D262423 | Alpert | Dec 1981 | |
| D299794 | Helstab | Feb 1989 | |
| D299795 | Helstab | Feb 1989 | |
| D328529 | Lenarczyk | Aug 1992 | |
| 420668 | Wallace | Feb 1890 | |
| 540503 | Loveland et al. | Jun 1895 | |
| 3304683 | Ferreira | Feb 1967 |
| Entry |
|---|
| Etagair Collection--DAS System brochure, Etagair GmbH, Jun. 30, 1994, (4 pages). |
| Number | Date | Country | |
|---|---|---|---|
| Parent | 64926 | Jan 1997 | |
| Parent | 39980 | Jun 1995 |