Number | Name | Date | Kind |
---|---|---|---|
4252195 | Fredd | Feb 1981 | |
4271903 | Slagle, Jr. et al. | Jun 1981 | |
5022427 | Churchman et al. | Jun 1991 | |
5207275 | Strattan et al. | May 1993 |
Entry |
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Offshore/Oilman, Oct., 1992, pp. 54 and 56, Annular Control System Provides Safety Margin In Gas-Lift Wells, Dwayne Leismer. |