Number | Name | Date | Kind |
---|---|---|---|
1274721 | Krzan | Aug 1918 | |
1505168 | Sparhawk | Aug 1924 | |
3217097 | Pauli et al. | Nov 1965 | |
4816211 | Parker et al. | Mar 1989 |
Number | Date | Country |
---|---|---|
2062820 | May 1981 | GBX |
Entry |
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Space/Aeronautics, "How close is a practical plasma rocket", Mar. 1960, pp. 50-54, by Stehling. |