Number | Name | Date | Kind |
---|---|---|---|
3823399 | Yamanaka | Jul 1974 | |
3909775 | Lavigne | Sep 1975 | |
4257482 | Kompanek | Mar 1981 | |
4389164 | Godbey et al. | Jun 1983 | |
4583915 | Montgomery et al. | Apr 1986 | |
4765186 | Dieulesaint et al. | Aug 1988 | |
4793178 | Ahern et al. | Dec 1988 | |
4805156 | Attali et al. | Feb 1989 | |
4934186 | McCoy | Jun 1990 | |
4965522 | Hazen et al. | Oct 1990 | |
5064349 | Turner et al. | Nov 1991 | |
5099918 | Bridges et al. | Mar 1992 | |
5117399 | McCoy et al. | May 1992 | |
5150334 | Crosby | Sep 1992 | |
5200894 | McCoy et al. | Apr 1993 | |
5372482 | London et al. | Dec 1994 |
Entry |
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Technology Brief Process Controller for Stripper Oil Well Pumping Units 4 pages Oct. 3, 1997 Echometer Brochure Echometer Gun Microphone Assemblies 4 pages Jul. 1997. |