Number | Name | Date | Kind |
---|---|---|---|
3149672 | Orkiszewski et al. | Sep 1964 | |
3211220 | Sarapuu | Oct 1965 | |
3547193 | Gill | Dec 1970 | |
3620300 | Crowson | Nov 1971 | |
3642066 | Gill | Feb 1972 | |
3724543 | Bell et al. | Apr 1973 | |
3908256 | Smith | Sep 1975 | |
4167972 | Sears | Sep 1979 |
Number | Date | Country |
---|---|---|
531223 | Dec 1976 | SUX |
604060 | Apr 1978 | SUX |
Entry |
---|
"Improving Earth-Ground Characteristics", Hoestenbach, Dec. 1976, Qst, pp. 16-17. |