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- Through-the-earth communications systems
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9/18/2012 - Contracts and cooperative agreementsA contract to analyze, adapt, and test an existing ultra-low frequency (ULF), through-the-earth system for communication and tracking of underground mine personnel.
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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.
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9/1/2012 - Peer reviewed journal articlesNational Institute for Occupational Safety and Health research aimed at demonstrating the feasibility of through-the-earth (TTE) wireless communication in mining.
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7/1/1990 - Conference papersAn ideal fire warning alarm system for underground mines would be low cost, convenient, fast, reliable, and able to warn all underground workers. The U.S. Bureau of Mine devised a one way communication system employs a large loop antenna and transmitter...
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7/1/1985 - Open File ReportsEfforts to produce electromagnetic systems for the location of trapped miners underground and to communicate with them were surveyed, from the 1920s to 1981. Theoretical studies of through-the-earth electromagnetic transmissions are described as well as...
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2/1/1984 - Contract reportsAn electromagnetic (EM) system for the location of trapped mine workers at coal-mine (300 m) depths has been developed.
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2/1/1984 - Peer reviewed journal articlesThe Bureau of Mines has conducted field studies in coal mines throughout the United States to determine the effectiveness of electromagnetic techniques in locating miners trapped underground following a mine accident.
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12/1/1983 - Reports of InvestigationsInformation on vertical magnetic noise in the voice frequency band, both within and above coal mines, is needed for the evaluation of through-the-earth baseband electromagnetic communications at mines where horizontal loop antennas are used. This report...
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12/1/1983 - Contract reports, Open File ReportsA new postdisaster communication and location system using through-the-earth electromagnetic wave propagation was tested at the Bureau of Mines Lake Lynn Experimental Mine. This describes the testing process and findings.
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9/1/1982 - Contract reportsA survey of the literature on extremely low-frequency and very low- frequency atmospheric noise was made.
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Content source: National Institute for Occupational Safety and Health, Mining Program