Number | Name | Date | Kind |
---|---|---|---|
1575945 | Stroud | Mar 1926 | |
1721004 | Debose | Jul 1929 | |
1819646 | Loomis et al. | Aug 1931 | |
2823900 | Kandle | Feb 1958 | |
3297100 | Crews | Jan 1967 | |
3655001 | Hoffman | Apr 1972 | |
3702059 | Jacoby | Nov 1972 | |
3713488 | Ellenburg | Jan 1973 | |
3788405 | Taylor | Jan 1974 | |
4190123 | Roddy | Feb 1980 | |
4289632 | Clear | Sep 1981 | |
4330155 | Richardson et al. | May 1982 |
Entry |
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20-Foot Diameter Blind Shaft Drilling, by Carone and Whitley, Sep. 20, 1980. |
Oil Rigs Revamped for Coal Mine Use, Industry News, Feb. 11, 1980. |
Composition and Properties of Oil Well Drilling Fluid, Rogers 3rd Edition .RTM.1963. |