Referenced by|
| US7095357 | 14 May 2003 | 22 Aug 2006 | | Method and apparatus for transmitting electromagnetic signals into the earth at frequencies below 500 KHz from a capacitor emplaced on the surface of the earth or raised aloft in an aircraft | | US7262602 | 8 Jul 2005 | 28 Aug 2007 | | Active geophysical prospecting system |
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