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11/22/2016 - Interagency agreementsAn interagency agreement to improve signal-to-noise in TTE receivers. The aim is to use existing transmitters that are not "intrinsically safe" to provide a reference signal from underground.
9/17/2012 - Contracts and cooperative agreementsA contract to design, build, and demonstrate a battery-powered, through-the-earth wireless voice communication system for overburdens of up to 600 feet.
2/1/1984 - Contract reportsAn electromagnetic (EM) system for the location of trapped mine workers at coal-mine (300 m) depths has been developed.