Number | Name | Date | Kind |
---|---|---|---|
3682259 | Cintract et al. | Aug 1972 | |
3717205 | Wilderman | Feb 1973 | |
3780883 | Brown | Dec 1973 | |
4024925 | Brown | May 1977 | |
4042123 | Sheldon et al. | Aug 1977 | |
4074774 | Brown et al. | Feb 1978 | |
4150727 | Shepherd | Apr 1979 | |
4434860 | Deyo | Mar 1984 | |
4759414 | Willis | Jul 1988 | |
4821816 | Willis | Apr 1989 | |
4890681 | Skelly | Jan 1990 | |
5004055 | Porritt et al. | Apr 1991 | |
5107940 | Berry | Apr 1992 | |
5251709 | Richardson | Oct 1993 |
Number | Date | Country |
---|---|---|
0 009 639 | Apr 1980 | EPX |
28 12 096 | Apr 1979 | DEX |
85 28 104 U | Feb 1986 | DEX |
Entry |
---|
Two-Man Crew . . . , The Oil and Gas Journal, Sep. 22, 1958, vol. 56, No. 38, p. 92. |