Number | Name | Date | Kind |
---|---|---|---|
3714831 | Quichaud et al. | Feb 1973 | |
4265305 | Stone et al. | May 1981 | |
4817710 | Edwards et al. | Apr 1989 | |
4901804 | Thometz et al. | Feb 1990 | |
4932471 | Tucker et al. | Jun 1990 | |
5320169 | Delatorre | Jun 1994 |
Entry |
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"The Gearhart MWD System" catalogue, Gearhart Industries, Inc. |