| Number | Name | Date | Kind |
|---|---|---|---|
| 1417663 | French | May 1922 | |
| 1539546 | Deenik | May 1925 | |
| 1927877 | Meyer | Sep 1933 | |
| 2057880 | Collison et al. | Oct 1936 | |
| 2143111 | Hayes | Jan 1939 | |
| 3572703 | Greene | Mar 1971 | |
| 3764900 | Baldwin | Oct 1973 | |
| 4133525 | Balles et al. | Jan 1979 | |
| 4408103 | Smith, III | Oct 1983 | |
| 4550503 | Klawitter | Nov 1985 | |
| 4718667 | Shoemaker, Jr. et al. | Jan 1988 | |
| 4778176 | Shoemaker, Jr. et al. | Oct 1988 | |
| 5397134 | Fishman et al. | Mar 1995 | |
| 5513772 | Glaser | May 1996 | |
| 5678823 | Chaffee et al. | Oct 1997 |
| Number | Date | Country |
|---|---|---|
| 685361 | Feb 1969 | ITX |
| 455355 | Nov 1936 | GBX |
| 574507 | Feb 1944 | GBX |
| 789575 | Apr 1955 | GBX |
| Entry |
|---|
| Science Newsfront, Popular Science, Jun. 1984, p. 14. |