Number | Name | Date | Kind |
---|---|---|---|
3021909 | Postlewaite | Feb 1962 | |
3032125 | Hiser et al. | May 1962 | |
3215202 | Pollard et al. | Nov 1965 | |
3458853 | Daniels et al. | Jul 1969 | |
3943725 | Pennock | Mar 1976 | |
4181453 | Vache | Jan 1980 | |
4192383 | Kirkland et al. | Mar 1980 | |
4226555 | Bourne, Jr. et al. | Oct 1980 | |
4260291 | Young et al. | Apr 1981 | |
4273471 | Burke | Jun 1981 |
Entry |
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NL Shaffer Company brochure "1978-1979 Composite Catalog of Oil Field Equipment & Services", pp. 4950-4954. |
Vetco Company brochure "1978-1979 Composite Catalog of Oil Field Equipment & Services", pp. 6861-6862. |
NL Shaffer Company brochure "1978-1979 Composite Catalog of Oil Field Equipment & Services," pp. 4945-4949. |
Vetco Company brochure "1978-1979 Composite Catalog of Oil Field Equipment & Services," pp. 6858-6860. |