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| Number | Title | Issue Date |
| 5518255 | Carbon-based composite ceramic sealing material A sealing member, comprising a discrete material including a plurality of individual pellets, each pellet comprising a core and a carbon based coating thereon, the plurality of individual pellets being aggregated and pressed together. Additionally, a meth... | 05/21/1996 |
| 4540184 | Sand-filled sealing structure between at least one tube and a tube support plate A sealing structure between at least one tube and a tube support plate having a hole for each tube to extend therethrough, characterized in that a ring member enclosing each tube with a space therefrom is secured to the tube support plate, a sand is fille... | 09/10/1985 |
| 4062551 | Cable seal unit for earth-boring drill strings The unit comprises a hollow cylindrical shell in the wall of which is formed an aperture through which an electrical cable passes. The cable thus passes from the ground surface on the outside of the drill string, but enters into the interior of the drill ... | 12/13/1977 |
