| Number | Name | Date | Kind |
|---|---|---|---|
| 1978107 | Hoffmann | Oct 1934 | |
| 2585268 | Olsen | Feb 1952 | |
| 3037773 | Chambers et al. | Jun 1962 | |
| 3206887 | Evler et al. | Sep 1965 | |
| 3309092 | Hardesty et al. | Mar 1967 | |
| 3565438 | Bischof | Nov 1968 | |
| 3973775 | Bolan et al. | Aug 1976 | |
| 4078804 | Coster et al. | Mar 1978 | |
| 4079941 | Morales | Mar 1978 | |
| 4157184 | Recard | Jun 1979 | |
| 4232864 | Yaworsky | Nov 1980 | |
| 4296928 | Nick | Oct 1981 | |
| 4341386 | Kleva | Jul 1982 | |
| 4385765 | Munn et al. | May 1983 | |
| 4570939 | Tourville et al. | Feb 1986 |
| Entry |
|---|
| Teaching Concepts, Inc., Advertisement Literature, "Space Hop", 1980. |
| Games Master Catalog, EON Products, Inc., "Cosmic Encounter", 1980, p. 45. |