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| Number | Title | Issue Date |
| 7543497 | Electrodynamic accelerometer An apparatus includes: a fluid container; a fluid mixture disposed within the fluid container, the fluid mixture including at least two components having different relative dielectric constants or different relative permeabilities; an imparter for imparting an elect... | 06/09/2009 |
| 7114580 | Method and apparatus for determining a trajectory of a directional drill An apparatus for determining a trajectory of a directional drill includes two length measurement devices deployed along a surface of the drill string and a controller capable of determining the heading of the drill string from two lengths of the drill string measure... | 10/03/2006 |
